The structure described by Pr4Fe33Al crystallizes in the monoclinic Cm space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(15), one Fe(16), one Fe(7), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(9), four equivalent Fe(17), and one Al(1) atom. In the second Pr site, Pr(2) is bonded in a 19-coordinate geometry to one Fe(12), one Fe(15), one Fe(16), one Fe(19), one Fe(8), two equivalent Fe(10), two equivalent Fe(14), two equivalent Fe(2), two equivalent Fe(4), two equivalent Fe(6), and four equivalent Fe(18) atoms. In the third Pr site, Pr(3) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(12), one Fe(15), one Fe(20), one Fe(7), two equivalent Fe(10), two equivalent Fe(17), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(13) atoms. In the fourth Pr site, Pr(4) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(12), one Fe(16), one Fe(21), one Fe(8), two equivalent Fe(1), two equivalent Fe(18), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(9), and four equivalent Fe(14) atoms. There are twenty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Pr(1), one Pr(4), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(21), one Fe(4), one Fe(5), two equivalent Fe(9), and one Al(1) atom. In the second Fe site, Fe(2) is bonded to one Pr(2), one Pr(3), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(20), one Fe(3), one Fe(6), and two equivalent Fe(10) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(17)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(17)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, and faces with three equivalent Fe(6)Pr2Fe10 cuboctahedra. In the third Fe site, Fe(3) is bonded to one Pr(1), one Pr(3), one Fe(10), one Fe(15), one Fe(17), one Fe(19), one Fe(2), one Fe(20), one Fe(3), one Fe(7), and two equivalent Fe(13) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(9)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(18)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(18)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(15)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with three equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(13)Pr3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Pr(2), one Pr(4), one Fe(1), one Fe(16), one Fe(18), one Fe(21), one Fe(4), one Fe(8), one Fe(9), two equivalent Fe(14), and one Al(1) atom. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Pr(1), one Pr(3), one Fe(1), one Fe(11), one Fe(13), one Fe(21), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(17), and one Al(1) atom. In the sixth Fe site, Fe(6) is bonded to one Pr(2), one Pr(4), one Fe(10), one Fe(12), one Fe(14), one Fe(19), one Fe(2), one Fe(20), one Fe(6), one Fe(8), and two equivalent Fe(18) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(9)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(13)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with three equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(18)Pr3Fe9 cuboctahedra. In the seventh Fe site, Fe(7) is bonded to one Pr(1), one Pr(3), one Fe(20), two equivalent Fe(13), two equivalent Fe(17), two equivalent Fe(3), two equivalent Fe(5), and one Al(1) atom to form distorted FePr2AlFe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(15)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra. In the eighth Fe site, Fe(8) is bonded to one Pr(2), one Pr(4), one Fe(19), one Fe(21), two equivalent Fe(14), two equivalent Fe(18), two equivalent Fe(4), and two equivalent Fe(6) atoms to form FePr2Fe10 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with three equivalent Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(6)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the ninth Fe site, Fe(9) is bonded to one Pr(1), one Pr(4), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(21), one Fe(4), one Fe(5), two equivalent Fe(1), and one Al(1) atom to form distorted FePr2AlFe9 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra. In the tenth Fe site, Fe(10) is bonded to one Pr(2), one Pr(3), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(20), one Fe(3), one Fe(6), and two equivalent Fe(2) atoms to form FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, and faces with three equivalent Fe(6)Pr2Fe10 cuboctahedra. In the eleventh Fe site, Fe(11) is bonded to one Pr(1), one Pr(3), one Pr(4), one Fe(21), two equivalent Fe(1), two equivalent Fe(17), two equivalent Fe(5), and two equivalent Fe(9) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(7)Pr2AlFe9 cuboctahedra, corners with four equivalent Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra. In the twelfth Fe site, Fe(12) is bonded to one Pr(2), one Pr(3), one Pr(4), one Fe(20), two equivalent Fe(10), two equivalent Fe(18), two equivalent Fe(2), and two equivalent Fe(6) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(8)Pr2Fe10 cuboctahedra, corners with four equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(6)Pr2Fe10 cuboctahedra. In the thirteenth Fe site, Fe(13) is bonded to one Pr(1), two equivalent Pr(3), one Fe(10), one Fe(15), one Fe(17), one Fe(2), one Fe(20), one Fe(5), one Fe(7), and two equivalent Fe(3) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, and faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra. In the fourteenth Fe site, Fe(14) is bonded to one Pr(2), two equivalent Pr(4), one Fe(1), one Fe(16), one Fe(18), one Fe(21), one Fe(6), one Fe(8), one Fe(9), and two equivalent Fe(4) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(2)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the fifteenth Fe site, Fe(15) is bonded to one Pr(1), one Pr(2), one Pr(3), one Fe(19), two equivalent Fe(10), two equivalent Fe(13), two equivalent Fe(2), and two equivalent Fe(3) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(7)Pr2AlFe9 cuboctahedra, corners with four equivalent Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra. In the sixteenth Fe site, Fe(16) is bonded to one Pr(1), one Pr(2), one Pr(4), two equivalent Fe(1), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(9), and one Al(1) atom to form FePr3AlFe8 cuboctahedra that share corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(8)Pr2Fe10 cuboctahedra, corners with four equivalent Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, edges with two equivalent Fe(6)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the seventeenth Fe site, Fe(17) is bonded to one Pr(3), two equivalent Pr(1), one Fe(1), one Fe(11), one Fe(13), one Fe(3), one Fe(7), one Fe(9), two equivalent Fe(5), and one Al(1) atom to form FePr3AlFe8 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(2)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra. In the eighteenth Fe site, Fe(18) is bonded to one Pr(4), two equivalent Pr(2), one Fe(10), one Fe(12), one Fe(14), one Fe(19), one Fe(2), one Fe(4), one Fe(8), and two equivalent Fe(6) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, and faces with four equivalent Fe(6)Pr2Fe10 cuboctahedra. In the nineteenth Fe site, Fe(19) is bonded in a 14-coordinate geometry to one Pr(2), one Fe(15), one Fe(20), one Fe(8), two equivalent Fe(10), two equivalent Fe(18), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(6) atoms. In the twentieth Fe site, Fe(20) is bonded in a 14-coordinate geometry to one Pr(3), one Fe(12), one Fe(19), one Fe(7), two equivalent Fe(10), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(6) atoms. In the twenty-first Fe site, Fe(21) is bonded in a 14-coordinate geometry to one Pr(4), one Fe(11), one Fe(8), two equivalent Fe(1), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(9), and one Al(1) atom. Al(1) is bonded in a 14-coordinate geometry to one Pr(1), one Fe(16), one Fe(21), one Fe(7), two equivalent Fe(1), two equivalent Fe(17), two equivalent Fe(4), two equivalent Fe(5), and two equivalent Fe(9) atoms. is represented by the CIF card [CIF]
data_Pr4AlFe33
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.498
_cell_length_b   6.498
_cell_length_c   13.025
_cell_angle_alpha   82.827
_cell_angle_beta   82.827
_cell_angle_gamma   82.851
_symmetry_Int_Tables_number   1
_cell_volume   538.153
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pr  Pr0  1  0.347  0.347  0.672  1.0
  Pr  Pr1  1  0.342  0.342  0.172  1.0
  Pr  Pr2  1  0.658  0.658  0.828  1.0
  Pr  Pr3  1  0.656  0.656  0.330  1.0
  Al  Al4  1  0.095  0.095  0.548  1.0
  Fe  Fe5  1  0.714  0.286  0.500  1.0
  Fe  Fe6  1  0.712  0.288  1.000  1.0
  Fe  Fe7  1  0.288  0.000  0.856  1.0
  Fe  Fe8  1  0.286  1.000  0.357  1.0
  Fe  Fe9  1  0.001  0.714  0.643  1.0
  Fe  Fe10  1  0.000  0.712  0.144  1.0
  Fe  Fe11  1  0.714  0.001  0.643  1.0
  Fe  Fe12  1  0.712  0.000  0.144  1.0
  Fe  Fe13  1  0.000  0.288  0.856  1.0
  Fe  Fe14  1  1.000  0.286  0.357  1.0
  Fe  Fe15  1  0.288  0.712  1.000  1.0
  Fe  Fe16  1  0.286  0.714  0.500  1.0
  Fe  Fe17  1  0.000  0.000  0.750  1.0
  Fe  Fe18  1  1.000  1.000  0.250  1.0
  Fe  Fe19  1  0.000  0.500  0.500  1.0
  Fe  Fe20  1  0.999  0.500  0.000  1.0
  Fe  Fe21  1  0.500  0.999  0.000  1.0
  Fe  Fe22  1  0.500  0.000  0.500  1.0
  Fe  Fe23  1  0.659  0.659  0.576  1.0
  Fe  Fe24  1  0.659  0.659  0.077  1.0
  Fe  Fe25  1  0.659  0.154  0.829  1.0
  Fe  Fe26  1  0.658  0.152  0.330  1.0
  Fe  Fe27  1  0.154  0.659  0.829  1.0
  Fe  Fe28  1  0.152  0.658  0.330  1.0
  Fe  Fe29  1  0.340  0.340  0.923  1.0
  Fe  Fe30  1  0.341  0.341  0.423  1.0
  Fe  Fe31  1  0.343  0.846  0.670  1.0
  Fe  Fe32  1  0.342  0.846  0.171  1.0
  Fe  Fe33  1  0.846  0.343  0.670  1.0
  Fe  Fe34  1  0.846  0.342  0.171  1.0
  Fe  Fe35  1  0.096  0.096  0.048  1.0
  Fe  Fe36  1  0.904  0.904  0.952  1.0
  Fe  Fe37  1  0.901  0.901  0.450  1.0
[/CIF]
.
The structure described by Pr4Fe33Al crystallizes in the monoclinic Cm space group. There are four inequivalent Pr sites. In the first Pr site, Pr(1) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(15), one Fe(16), one Fe(7), two equivalent Fe(1), two equivalent Fe(13), two equivalent Fe(3), two equivalent Fe(5), two equivalent Fe(9), four equivalent Fe(17), and one Al(1) atom. In the second Pr site, Pr(2) is bonded in a 19-coordinate geometry to one Fe(12), one Fe(15), one Fe(16), one Fe(19), one Fe(8), two equivalent Fe(10), two equivalent Fe(14), two equivalent Fe(2), two equivalent Fe(4), two equivalent Fe(6), and four equivalent Fe(18) atoms. In the third Pr site, Pr(3) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(12), one Fe(15), one Fe(20), one Fe(7), two equivalent Fe(10), two equivalent Fe(17), two equivalent Fe(2), two equivalent Fe(3), two equivalent Fe(5), and four equivalent Fe(13) atoms. In the fourth Pr site, Pr(4) is bonded in a 19-coordinate geometry to one Fe(11), one Fe(12), one Fe(16), one Fe(21), one Fe(8), two equivalent Fe(1), two equivalent Fe(18), two equivalent Fe(4), two equivalent Fe(6), two equivalent Fe(9), and four equivalent Fe(14) atoms. There are twenty-one inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 12-coordinate geometry to one Pr(1), one Pr(4), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(21), one Fe(4), one Fe(5), two equivalent Fe(9), and one Al(1) atom. In the second Fe site, Fe(2) is bonded to one Pr(2), one Pr(3), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(20), one Fe(3), one Fe(6), and two equivalent Fe(10) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(17)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(17)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, and faces with three equivalent Fe(6)Pr2Fe10 cuboctahedra. In the third Fe site, Fe(3) is bonded to one Pr(1), one Pr(3), one Fe(10), one Fe(15), one Fe(17), one Fe(19), one Fe(2), one Fe(20), one Fe(3), one Fe(7), and two equivalent Fe(13) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(9)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(18)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(18)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(15)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with three equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(13)Pr3Fe9 cuboctahedra. In the fourth Fe site, Fe(4) is bonded in a 12-coordinate geometry to one Pr(2), one Pr(4), one Fe(1), one Fe(16), one Fe(18), one Fe(21), one Fe(4), one Fe(8), one Fe(9), two equivalent Fe(14), and one Al(1) atom. In the fifth Fe site, Fe(5) is bonded in a 12-coordinate geometry to one Pr(1), one Pr(3), one Fe(1), one Fe(11), one Fe(13), one Fe(21), one Fe(5), one Fe(7), one Fe(9), two equivalent Fe(17), and one Al(1) atom. In the sixth Fe site, Fe(6) is bonded to one Pr(2), one Pr(4), one Fe(10), one Fe(12), one Fe(14), one Fe(19), one Fe(2), one Fe(20), one Fe(6), one Fe(8), and two equivalent Fe(18) atoms to form distorted FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(9)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(13)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with three equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(18)Pr3Fe9 cuboctahedra. In the seventh Fe site, Fe(7) is bonded to one Pr(1), one Pr(3), one Fe(20), two equivalent Fe(13), two equivalent Fe(17), two equivalent Fe(3), two equivalent Fe(5), and one Al(1) atom to form distorted FePr2AlFe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(15)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra. In the eighth Fe site, Fe(8) is bonded to one Pr(2), one Pr(4), one Fe(19), one Fe(21), two equivalent Fe(14), two equivalent Fe(18), two equivalent Fe(4), and two equivalent Fe(6) atoms to form FePr2Fe10 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with three equivalent Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(6)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the ninth Fe site, Fe(9) is bonded to one Pr(1), one Pr(4), one Fe(11), one Fe(14), one Fe(16), one Fe(17), one Fe(21), one Fe(4), one Fe(5), two equivalent Fe(1), and one Al(1) atom to form distorted FePr2AlFe9 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra. In the tenth Fe site, Fe(10) is bonded to one Pr(2), one Pr(3), one Fe(12), one Fe(13), one Fe(15), one Fe(18), one Fe(19), one Fe(20), one Fe(3), one Fe(6), and two equivalent Fe(2) atoms to form FePr2Fe10 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with three equivalent Fe(3)Pr2Fe10 cuboctahedra, and faces with three equivalent Fe(6)Pr2Fe10 cuboctahedra. In the eleventh Fe site, Fe(11) is bonded to one Pr(1), one Pr(3), one Pr(4), one Fe(21), two equivalent Fe(1), two equivalent Fe(17), two equivalent Fe(5), and two equivalent Fe(9) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(7)Pr2AlFe9 cuboctahedra, corners with four equivalent Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, edges with two equivalent Fe(3)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra. In the twelfth Fe site, Fe(12) is bonded to one Pr(2), one Pr(3), one Pr(4), one Fe(20), two equivalent Fe(10), two equivalent Fe(18), two equivalent Fe(2), and two equivalent Fe(6) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(8)Pr2Fe10 cuboctahedra, corners with four equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(6)Pr2Fe10 cuboctahedra. In the thirteenth Fe site, Fe(13) is bonded to one Pr(1), two equivalent Pr(3), one Fe(10), one Fe(15), one Fe(17), one Fe(2), one Fe(20), one Fe(5), one Fe(7), and two equivalent Fe(3) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(6)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(17)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(13)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(6)Pr2Fe10 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, and faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra. In the fourteenth Fe site, Fe(14) is bonded to one Pr(2), two equivalent Pr(4), one Fe(1), one Fe(16), one Fe(18), one Fe(21), one Fe(6), one Fe(8), one Fe(9), and two equivalent Fe(4) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(2)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(15)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(18)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(6)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(18)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(14)Pr3Fe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the fifteenth Fe site, Fe(15) is bonded to one Pr(1), one Pr(2), one Pr(3), one Fe(19), two equivalent Fe(10), two equivalent Fe(13), two equivalent Fe(2), and two equivalent Fe(3) atoms to form FePr3Fe9 cuboctahedra that share corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(16)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(7)Pr2AlFe9 cuboctahedra, corners with four equivalent Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(11)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(10)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(6)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, faces with four equivalent Fe(2)Pr2Fe10 cuboctahedra, and faces with four equivalent Fe(3)Pr2Fe10 cuboctahedra. In the sixteenth Fe site, Fe(16) is bonded to one Pr(1), one Pr(2), one Pr(4), two equivalent Fe(1), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(9), and one Al(1) atom to form FePr3AlFe8 cuboctahedra that share corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(15)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(8)Pr2Fe10 cuboctahedra, corners with four equivalent Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(12)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, edges with two equivalent Fe(6)Pr2Fe10 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, and faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra. In the seventeenth Fe site, Fe(17) is bonded to one Pr(3), two equivalent Pr(1), one Fe(1), one Fe(11), one Fe(13), one Fe(3), one Fe(7), one Fe(9), two equivalent Fe(5), and one Al(1) atom to form FePr3AlFe8 cuboctahedra that share  a cornercorner with one Fe(7)Pr2AlFe9 cuboctahedra,  a cornercorner with one Fe(2)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(3)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, corners with two equivalent Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(14)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(7)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(3)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(13)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(17)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(7)Pr2AlFe9 cuboctahedra,  a faceface with one Fe(2)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(11)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, faces with two equivalent Fe(3)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(17)Pr3AlFe8 cuboctahedra, and faces with two equivalent Fe(13)Pr3Fe9 cuboctahedra. In the eighteenth Fe site, Fe(18) is bonded to one Pr(4), two equivalent Pr(2), one Fe(10), one Fe(12), one Fe(14), one Fe(19), one Fe(2), one Fe(4), one Fe(8), and two equivalent Fe(6) atoms to form FePr3Fe9 cuboctahedra that share  a cornercorner with one Fe(3)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(8)Pr2Fe10 cuboctahedra,  a cornercorner with one Fe(11)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(9)Pr2AlFe9 cuboctahedra, corners with two equivalent Fe(10)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(2)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(6)Pr2Fe10 cuboctahedra, corners with two equivalent Fe(12)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(13)Pr3Fe9 cuboctahedra, corners with two equivalent Fe(18)Pr3Fe9 cuboctahedra, corners with three equivalent Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(9)Pr2AlFe9 cuboctahedra,  an edgeedge with one Fe(10)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(2)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(8)Pr2Fe10 cuboctahedra,  an edgeedge with one Fe(16)Pr3AlFe8 cuboctahedra,  an edgeedge with one Fe(14)Pr3Fe9 cuboctahedra,  an edgeedge with one Fe(15)Pr3Fe9 cuboctahedra, edges with two equivalent Fe(18)Pr3Fe9 cuboctahedra,  a faceface with one Fe(3)Pr2Fe10 cuboctahedra,  a faceface with one Fe(8)Pr2Fe10 cuboctahedra,  a faceface with one Fe(16)Pr3AlFe8 cuboctahedra,  a faceface with one Fe(12)Pr3Fe9 cuboctahedra,  a faceface with one Fe(15)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(10)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(2)Pr2Fe10 cuboctahedra, faces with two equivalent Fe(14)Pr3Fe9 cuboctahedra, faces with two equivalent Fe(18)Pr3Fe9 cuboctahedra, and faces with four equivalent Fe(6)Pr2Fe10 cuboctahedra. In the nineteenth Fe site, Fe(19) is bonded in a 14-coordinate geometry to one Pr(2), one Fe(15), one Fe(20), one Fe(8), two equivalent Fe(10), two equivalent Fe(18), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(6) atoms. In the twentieth Fe site, Fe(20) is bonded in a 14-coordinate geometry to one Pr(3), one Fe(12), one Fe(19), one Fe(7), two equivalent Fe(10), two equivalent Fe(13), two equivalent Fe(2), two equivalent Fe(3), and two equivalent Fe(6) atoms. In the twenty-first Fe site, Fe(21) is bonded in a 14-coordinate geometry to one Pr(4), one Fe(11), one Fe(8), two equivalent Fe(1), two equivalent Fe(14), two equivalent Fe(4), two equivalent Fe(5), two equivalent Fe(9), and one Al(1) atom. Al(1) is bonded in a 14-coordinate geometry to one Pr(1), one Fe(16), one Fe(21), one Fe(7), two equivalent Fe(1), two equivalent Fe(17), two equivalent Fe(4), two equivalent Fe(5), and two equivalent Fe(9) atoms. is represented by the CIF card [CIF]
data_Pr4AlFe33
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.498
_cell_length_b   6.498
_cell_length_c   13.025
_cell_angle_alpha   82.827
_cell_angle_beta   82.827
_cell_angle_gamma   82.851
_symmetry_Int_Tables_number   1
_cell_volume   538.153
_cell_formula_units_Z   1
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Pr  Pr0  1  0.347  0.347  0.672  1.0
  Pr  Pr1  1  0.342  0.342  0.172  1.0
  Pr  Pr2  1  0.658  0.658  0.828  1.0
  Pr  Pr3  1  0.656  0.656  0.330  1.0
  Al  Al4  1  0.095  0.095  0.548  1.0
  Fe  Fe5  1  0.714  0.286  0.500  1.0
  Fe  Fe6  1  0.712  0.288  1.000  1.0
  Fe  Fe7  1  0.288  0.000  0.856  1.0
  Fe  Fe8  1  0.286  1.000  0.357  1.0
  Fe  Fe9  1  0.001  0.714  0.643  1.0
  Fe  Fe10  1  0.000  0.712  0.144  1.0
  Fe  Fe11  1  0.714  0.001  0.643  1.0
  Fe  Fe12  1  0.712  0.000  0.144  1.0
  Fe  Fe13  1  0.000  0.288  0.856  1.0
  Fe  Fe14  1  1.000  0.286  0.357  1.0
  Fe  Fe15  1  0.288  0.712  1.000  1.0
  Fe  Fe16  1  0.286  0.714  0.500  1.0
  Fe  Fe17  1  0.000  0.000  0.750  1.0
  Fe  Fe18  1  1.000  1.000  0.250  1.0
  Fe  Fe19  1  0.000  0.500  0.500  1.0
  Fe  Fe20  1  0.999  0.500  0.000  1.0
  Fe  Fe21  1  0.500  0.999  0.000  1.0
  Fe  Fe22  1  0.500  0.000  0.500  1.0
  Fe  Fe23  1  0.659  0.659  0.576  1.0
  Fe  Fe24  1  0.659  0.659  0.077  1.0
  Fe  Fe25  1  0.659  0.154  0.829  1.0
  Fe  Fe26  1  0.658  0.152  0.330  1.0
  Fe  Fe27  1  0.154  0.659  0.829  1.0
  Fe  Fe28  1  0.152  0.658  0.330  1.0
  Fe  Fe29  1  0.340  0.340  0.923  1.0
  Fe  Fe30  1  0.341  0.341  0.423  1.0
  Fe  Fe31  1  0.343  0.846  0.670  1.0
  Fe  Fe32  1  0.342  0.846  0.171  1.0
  Fe  Fe33  1  0.846  0.343  0.670  1.0
  Fe  Fe34  1  0.846  0.342  0.171  1.0
  Fe  Fe35  1  0.096  0.096  0.048  1.0
  Fe  Fe36  1  0.904  0.904  0.952  1.0
  Fe  Fe37  1  0.901  0.901  0.450  1.0
[/CIF]
.