The crystal structure described by Ca(Ce2Se3)4 crystallizes in the monoclinic Cc space group. Ca(1) is bonded to one Se(1), one Se(11), one Se(2), one Se(3), one Se(6), one Se(7), one Se(8), and one Se(9) atom to form distorted CaSe8 hexagonal bipyramids that share  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(4)Se8 hexagonal bipyramids,  an edgeedge with one Ce(3)Se8 hexagonal bipyramid,  an edgeedge with one Ce(8)Se8 hexagonal bipyramid, edges with two equivalent Ce(5)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(7)Se8 hexagonal bipyramids. There are eight inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(10), one Se(12), one Se(2), one Se(4), one Se(5), one Se(6), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ce(3)Se8 hexagonal bipyramid,  an edgeedge with one Ce(5)Se8 hexagonal bipyramid, edges with two equivalent Ce(8)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid, and faces with two equivalent Ce(4)Se8 hexagonal bipyramids. In the second Ce site, Ce(2) is bonded to one Se(1), one Se(10), one Se(11), one Se(2), one Se(3), one Se(4), one Se(5), and one Se(6) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ca(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(5)Se8 hexagonal bipyramids, corners with two equivalent Ce(8)Se8 hexagonal bipyramids, edges with two equivalent Ce(4)Se8 hexagonal bipyramids, edges with two equivalent Ce(7)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, faces with two equivalent Ce(3)Se8 hexagonal bipyramids, and faces with two equivalent Ce(6)Se8 hexagonal bipyramids. In the third Ce site, Ce(3) is bonded to one Se(10), one Se(11), one Se(2), one Se(3), one Se(5), one Se(6), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(4)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ca(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(1)Se8 hexagonal bipyramid, edges with two equivalent Ce(6)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(2)Se8 hexagonal bipyramids. In the fourth Ce site, Ce(4) is bonded to one Se(12), one Se(2), one Se(3), one Se(4), one Se(5), one Se(7), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ca(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(3)Se8 hexagonal bipyramids, corners with two equivalent Ce(5)Se8 hexagonal bipyramids, corners with two equivalent Ce(6)Se8 hexagonal bipyramids, edges with two equivalent Ce(2)Se8 hexagonal bipyramids, edges with two equivalent Ce(7)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid, faces with two equivalent Ce(1)Se8 hexagonal bipyramids, and faces with two equivalent Ce(8)Se8 hexagonal bipyramids. In the fifth Ce site, Ce(5) is bonded to one Se(1), one Se(10), one Se(12), one Se(4), one Se(5), one Se(6), one Se(7), and one Se(8) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(4)Se8 hexagonal bipyramids,  an edgeedge with one Ce(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(6)Se8 hexagonal bipyramid, edges with two equivalent Ca(1)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(7)Se8 hexagonal bipyramids. In the sixth Ce site, Ce(6) is bonded to one Se(1), one Se(10), one Se(11), one Se(12), one Se(3), one Se(4), one Se(5), and one Se(7) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(4)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ce(5)Se8 hexagonal bipyramid,  an edgeedge with one Ce(8)Se8 hexagonal bipyramid, edges with two equivalent Ce(3)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(2)Se8 hexagonal bipyramids. In the seventh Ce site, Ce(7) is bonded to one Se(1), one Se(10), one Se(11), one Se(12), one Se(6), one Se(7), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ce(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(3)Se8 hexagonal bipyramids, corners with two equivalent Ce(6)Se8 hexagonal bipyramids, corners with two equivalent Ce(8)Se8 hexagonal bipyramids, edges with two equivalent Ce(2)Se8 hexagonal bipyramids, edges with two equivalent Ce(4)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, faces with two equivalent Ca(1)Se8 hexagonal bipyramids, and faces with two equivalent Ce(5)Se8 hexagonal bipyramids. In the eighth Ce site, Ce(8) is bonded to one Se(1), one Se(11), one Se(12), one Se(2), one Se(3), one Se(4), one Se(7), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ca(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(6)Se8 hexagonal bipyramid, edges with two equivalent Ce(1)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid, and faces with two equivalent Ce(4)Se8 hexagonal bipyramids. There are twelve inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ca(1), one Ce(2), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(6)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with three equivalent Se(8)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the second Se site, Se(2) is bonded to one Ca(1), one Ce(1), one Ce(2), one Ce(3), one Ce(4), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(1)CaCe5 octahedra,  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(12)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the third Se site, Se(3) is bonded to one Ca(1), one Ce(2), one Ce(3), one Ce(4), one Ce(6), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(5)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with three equivalent Se(10)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the fourth Se site, Se(4) is bonded to one Ce(1), one Ce(2), one Ce(4), one Ce(5), one Ce(6), and one Ce(8) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(6)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with three equivalent Se(9)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the fifth Se site, Se(5) is bonded to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one Ce(5), and one Ce(6) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(3)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with three equivalent Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the sixth Se site, Se(6) is bonded to one Ca(1), one Ce(1), one Ce(2), one Ce(3), one Ce(5), and one Ce(7) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(1)CaCe5 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(7)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra, and  a faceface with one Se(12)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the seventh Se site, Se(7) is bonded to one Ca(1), one Ce(4), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra,  a cornercorner with one Se(5)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with three equivalent Se(6)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the eighth Se site, Se(8) is bonded to one Ca(1), one Ce(1), one Ce(3), one Ce(4), one Ce(5), and one Ce(7) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(3)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(10)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the ninth Se site, Se(9) is bonded to one Ca(1), one Ce(1), one Ce(3), one Ce(4), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(12)Ce6 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with three equivalent Se(4)Ce6 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the tenth Se site, Se(10) is bonded to one Ce(1), one Ce(2), one Ce(3), one Ce(5), one Ce(6), and one Ce(7) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(9)CaCe5 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(3)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(4)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the eleventh Se site, Se(11) is bonded to one Ca(1), one Ce(2), one Ce(3), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(12)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with three equivalent Se(5)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra, and  a faceface with one Se(10)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the twelfth Se site, Se(12) is bonded to one Ce(1), one Ce(4), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(9)CaCe5 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(2)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. is represented by the CIF card [CIF]
data_Ca(Ce2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.939
_cell_length_b   8.939
_cell_length_c   14.794
_cell_angle_alpha   72.419
_cell_angle_beta   72.419
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1068.818
_cell_formula_units_Z   2
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
  Ca  Ca0  1  0.417  0.542  0.167  1.0
  Ca  Ca1  1  0.542  0.417  0.667  1.0
  Ce  Ce2  1  0.875  0.750  0.000  1.0
  Ce  Ce3  1  0.209  0.957  0.083  1.0
  Ce  Ce4  1  0.959  0.584  0.333  1.0
  Ce  Ce5  1  0.625  0.873  0.250  1.0
  Ce  Ce6  1  0.917  0.291  0.167  1.0
  Ce  Ce7  1  0.209  0.085  0.333  1.0
  Ce  Ce8  1  0.541  0.292  0.417  1.0
  Ce  Ce9  1  0.750  0.875  0.500  1.0
  Ce  Ce10  1  0.291  0.917  0.667  1.0
  Ce  Ce11  1  0.957  0.209  0.583  1.0
  Ce  Ce12  1  0.251  0.625  0.500  1.0
  Ce  Ce13  1  0.873  0.625  0.750  1.0
  Ce  Ce14  1  0.085  0.209  0.833  1.0
  Ce  Ce15  1  0.625  0.251  0.000  1.0
  Ce  Ce16  1  0.292  0.541  0.917  1.0
  Ce  Ce17  1  0.584  0.959  0.833  1.0
  Se  Se18  1  0.265  0.264  0.116  1.0
  Se  Se19  1  0.551  0.903  0.049  1.0
  Se  Se20  1  0.282  0.786  0.285  1.0
  Se  Se21  1  0.900  0.050  0.050  1.0
  Se  Se22  1  0.933  0.934  0.283  1.0
  Se  Se23  1  0.117  0.615  0.117  1.0
  Se  Se24  1  0.568  0.213  0.217  1.0
  Se  Se25  1  0.716  0.565  0.216  1.0
  Se  Se26  1  0.601  0.600  0.450  1.0
  Se  Se27  1  0.884  0.233  0.384  1.0
  Se  Se28  1  0.234  0.385  0.383  1.0
  Se  Se29  1  0.615  0.117  0.617  1.0
  Se  Se30  1  0.264  0.265  0.616  1.0
  Se  Se31  1  0.450  0.949  0.450  1.0
  Se  Se32  1  0.903  0.551  0.549  1.0
  Se  Se33  1  0.050  0.900  0.550  1.0
  Se  Se34  1  0.934  0.933  0.783  1.0
  Se  Se35  1  0.213  0.568  0.717  1.0
  Se  Se36  1  0.565  0.716  0.716  1.0
  Se  Se37  1  0.949  0.450  0.950  1.0
  Se  Se38  1  0.600  0.601  0.950  1.0
  Se  Se39  1  0.233  0.884  0.884  1.0
  Se  Se40  1  0.786  0.282  0.785  1.0
  Se  Se41  1  0.385  0.234  0.883  1.0
[/CIF]
.
The crystal structure described by Ca(Ce2Se3)4 crystallizes in the monoclinic Cc space group. Ca(1) is bonded to one Se(1), one Se(11), one Se(2), one Se(3), one Se(6), one Se(7), one Se(8), and one Se(9) atom to form distorted CaSe8 hexagonal bipyramids that share  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(4)Se8 hexagonal bipyramids,  an edgeedge with one Ce(3)Se8 hexagonal bipyramid,  an edgeedge with one Ce(8)Se8 hexagonal bipyramid, edges with two equivalent Ce(5)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(7)Se8 hexagonal bipyramids. There are eight inequivalent Ce sites. In the first Ce site, Ce(1) is bonded to one Se(10), one Se(12), one Se(2), one Se(4), one Se(5), one Se(6), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ce(3)Se8 hexagonal bipyramid,  an edgeedge with one Ce(5)Se8 hexagonal bipyramid, edges with two equivalent Ce(8)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid, and faces with two equivalent Ce(4)Se8 hexagonal bipyramids. In the second Ce site, Ce(2) is bonded to one Se(1), one Se(10), one Se(11), one Se(2), one Se(3), one Se(4), one Se(5), and one Se(6) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ca(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(5)Se8 hexagonal bipyramids, corners with two equivalent Ce(8)Se8 hexagonal bipyramids, edges with two equivalent Ce(4)Se8 hexagonal bipyramids, edges with two equivalent Ce(7)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, faces with two equivalent Ce(3)Se8 hexagonal bipyramids, and faces with two equivalent Ce(6)Se8 hexagonal bipyramids. In the third Ce site, Ce(3) is bonded to one Se(10), one Se(11), one Se(2), one Se(3), one Se(5), one Se(6), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(4)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ca(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(1)Se8 hexagonal bipyramid, edges with two equivalent Ce(6)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(2)Se8 hexagonal bipyramids. In the fourth Ce site, Ce(4) is bonded to one Se(12), one Se(2), one Se(3), one Se(4), one Se(5), one Se(7), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ca(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(3)Se8 hexagonal bipyramids, corners with two equivalent Ce(5)Se8 hexagonal bipyramids, corners with two equivalent Ce(6)Se8 hexagonal bipyramids, edges with two equivalent Ce(2)Se8 hexagonal bipyramids, edges with two equivalent Ce(7)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid, faces with two equivalent Ce(1)Se8 hexagonal bipyramids, and faces with two equivalent Ce(8)Se8 hexagonal bipyramids. In the fifth Ce site, Ce(5) is bonded to one Se(1), one Se(10), one Se(12), one Se(4), one Se(5), one Se(6), one Se(7), and one Se(8) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(4)Se8 hexagonal bipyramids,  an edgeedge with one Ce(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(6)Se8 hexagonal bipyramid, edges with two equivalent Ca(1)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(7)Se8 hexagonal bipyramids. In the sixth Ce site, Ce(6) is bonded to one Se(1), one Se(10), one Se(11), one Se(12), one Se(3), one Se(4), one Se(5), and one Se(7) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(8)Se8 hexagonal bipyramid, corners with two equivalent Ce(4)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ce(5)Se8 hexagonal bipyramid,  an edgeedge with one Ce(8)Se8 hexagonal bipyramid, edges with two equivalent Ce(3)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(4)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, and faces with two equivalent Ce(2)Se8 hexagonal bipyramids. In the seventh Ce site, Ce(7) is bonded to one Se(1), one Se(10), one Se(11), one Se(12), one Se(6), one Se(7), one Se(8), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share corners with two equivalent Ce(1)Se8 hexagonal bipyramids, corners with two equivalent Ce(3)Se8 hexagonal bipyramids, corners with two equivalent Ce(6)Se8 hexagonal bipyramids, corners with two equivalent Ce(8)Se8 hexagonal bipyramids, edges with two equivalent Ce(2)Se8 hexagonal bipyramids, edges with two equivalent Ce(4)Se8 hexagonal bipyramids,  a faceface with one Ce(1)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(8)Se8 hexagonal bipyramid, faces with two equivalent Ca(1)Se8 hexagonal bipyramids, and faces with two equivalent Ce(5)Se8 hexagonal bipyramids. In the eighth Ce site, Ce(8) is bonded to one Se(1), one Se(11), one Se(12), one Se(2), one Se(3), one Se(4), one Se(7), and one Se(9) atom to form distorted CeSe8 hexagonal bipyramids that share  a cornercorner with one Ca(1)Se8 hexagonal bipyramid,  a cornercorner with one Ce(3)Se8 hexagonal bipyramid,  a cornercorner with one Ce(5)Se8 hexagonal bipyramid,  a cornercorner with one Ce(6)Se8 hexagonal bipyramid, corners with two equivalent Ce(2)Se8 hexagonal bipyramids, corners with two equivalent Ce(7)Se8 hexagonal bipyramids,  an edgeedge with one Ca(1)Se8 hexagonal bipyramid,  an edgeedge with one Ce(6)Se8 hexagonal bipyramid, edges with two equivalent Ce(1)Se8 hexagonal bipyramids,  a faceface with one Ca(1)Se8 hexagonal bipyramid,  a faceface with one Ce(2)Se8 hexagonal bipyramid,  a faceface with one Ce(3)Se8 hexagonal bipyramid,  a faceface with one Ce(5)Se8 hexagonal bipyramid,  a faceface with one Ce(6)Se8 hexagonal bipyramid,  a faceface with one Ce(7)Se8 hexagonal bipyramid, and faces with two equivalent Ce(4)Se8 hexagonal bipyramids. There are twelve inequivalent Se sites. In the first Se site, Se(1) is bonded to one Ca(1), one Ce(2), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(6)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with three equivalent Se(8)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the second Se site, Se(2) is bonded to one Ca(1), one Ce(1), one Ce(2), one Ce(3), one Ce(4), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(1)CaCe5 octahedra,  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(12)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the third Se site, Se(3) is bonded to one Ca(1), one Ce(2), one Ce(3), one Ce(4), one Ce(6), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(5)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with three equivalent Se(10)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the fourth Se site, Se(4) is bonded to one Ce(1), one Ce(2), one Ce(4), one Ce(5), one Ce(6), and one Ce(8) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(6)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with three equivalent Se(9)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the fifth Se site, Se(5) is bonded to one Ce(1), one Ce(2), one Ce(3), one Ce(4), one Ce(5), and one Ce(6) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(3)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with three equivalent Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the sixth Se site, Se(6) is bonded to one Ca(1), one Ce(1), one Ce(2), one Ce(3), one Ce(5), and one Ce(7) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(1)CaCe5 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(7)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(10)Ce6 octahedra, and  a faceface with one Se(12)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the seventh Se site, Se(7) is bonded to one Ca(1), one Ce(4), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra,  a cornercorner with one Se(5)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with three equivalent Se(6)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the eighth Se site, Se(8) is bonded to one Ca(1), one Ce(1), one Ce(3), one Ce(4), one Ce(5), and one Ce(7) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(3)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(10)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the ninth Se site, Se(9) is bonded to one Ca(1), one Ce(1), one Ce(3), one Ce(4), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(12)Ce6 octahedra, corners with two equivalent Se(11)CaCe5 octahedra, corners with two equivalent Se(2)CaCe5 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(7)CaCe5 octahedra, corners with three equivalent Se(4)Ce6 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(3)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(12)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the tenth Se site, Se(10) is bonded to one Ce(1), one Ce(2), one Ce(3), one Ce(5), one Ce(6), and one Ce(7) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(9)CaCe5 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(12)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(3)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(2)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  a faceface with one Se(11)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(8)CaCe5 octahedra,  a faceface with one Se(4)Ce6 octahedra, and  a faceface with one Se(5)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the eleventh Se site, Se(11) is bonded to one Ca(1), one Ce(2), one Ce(3), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCaCe5 octahedra that share  a cornercorner with one Se(2)CaCe5 octahedra,  a cornercorner with one Se(7)CaCe5 octahedra,  a cornercorner with one Se(8)CaCe5 octahedra,  a cornercorner with one Se(10)Ce6 octahedra,  a cornercorner with one Se(12)Ce6 octahedra,  a cornercorner with one Se(4)Ce6 octahedra, corners with two equivalent Se(3)CaCe5 octahedra, corners with two equivalent Se(6)CaCe5 octahedra, corners with two equivalent Se(9)CaCe5 octahedra, corners with three equivalent Se(5)Ce6 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(6)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(9)CaCe5 octahedra,  an edgeedge with one Se(12)Ce6 octahedra,  an edgeedge with one Se(4)Ce6 octahedra,  a faceface with one Se(1)CaCe5 octahedra,  a faceface with one Se(2)CaCe5 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra, and  a faceface with one Se(10)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. In the twelfth Se site, Se(12) is bonded to one Ce(1), one Ce(4), one Ce(5), one Ce(6), one Ce(7), and one Ce(8) atom to form distorted SeCe6 octahedra that share  a cornercorner with one Se(11)CaCe5 octahedra,  a cornercorner with one Se(9)CaCe5 octahedra, corners with two equivalent Se(1)CaCe5 octahedra, corners with two equivalent Se(8)CaCe5 octahedra, corners with two equivalent Se(10)Ce6 octahedra, corners with two equivalent Se(4)Ce6 octahedra, corners with two equivalent Se(5)Ce6 octahedra, corners with three equivalent Se(2)CaCe5 octahedra,  an edgeedge with one Se(1)CaCe5 octahedra,  an edgeedge with one Se(11)CaCe5 octahedra,  an edgeedge with one Se(7)CaCe5 octahedra,  an edgeedge with one Se(8)CaCe5 octahedra,  an edgeedge with one Se(10)Ce6 octahedra,  an edgeedge with one Se(5)Ce6 octahedra,  a faceface with one Se(3)CaCe5 octahedra,  a faceface with one Se(6)CaCe5 octahedra,  a faceface with one Se(7)CaCe5 octahedra,  a faceface with one Se(9)CaCe5 octahedra, and  a faceface with one Se(4)Ce6 octahedra. The corner-sharing octahedral tilt angles range from 17-50°. is represented by the CIF card [CIF]
data_Ca(Ce2Se3)4
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.939
_cell_length_b   8.939
_cell_length_c   14.794
_cell_angle_alpha   72.419
_cell_angle_beta   72.419
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   1068.818
_cell_formula_units_Z   2
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
  Ca  Ca0  1  0.417  0.542  0.167  1.0
  Ca  Ca1  1  0.542  0.417  0.667  1.0
  Ce  Ce2  1  0.875  0.750  0.000  1.0
  Ce  Ce3  1  0.209  0.957  0.083  1.0
  Ce  Ce4  1  0.959  0.584  0.333  1.0
  Ce  Ce5  1  0.625  0.873  0.250  1.0
  Ce  Ce6  1  0.917  0.291  0.167  1.0
  Ce  Ce7  1  0.209  0.085  0.333  1.0
  Ce  Ce8  1  0.541  0.292  0.417  1.0
  Ce  Ce9  1  0.750  0.875  0.500  1.0
  Ce  Ce10  1  0.291  0.917  0.667  1.0
  Ce  Ce11  1  0.957  0.209  0.583  1.0
  Ce  Ce12  1  0.251  0.625  0.500  1.0
  Ce  Ce13  1  0.873  0.625  0.750  1.0
  Ce  Ce14  1  0.085  0.209  0.833  1.0
  Ce  Ce15  1  0.625  0.251  0.000  1.0
  Ce  Ce16  1  0.292  0.541  0.917  1.0
  Ce  Ce17  1  0.584  0.959  0.833  1.0
  Se  Se18  1  0.265  0.264  0.116  1.0
  Se  Se19  1  0.551  0.903  0.049  1.0
  Se  Se20  1  0.282  0.786  0.285  1.0
  Se  Se21  1  0.900  0.050  0.050  1.0
  Se  Se22  1  0.933  0.934  0.283  1.0
  Se  Se23  1  0.117  0.615  0.117  1.0
  Se  Se24  1  0.568  0.213  0.217  1.0
  Se  Se25  1  0.716  0.565  0.216  1.0
  Se  Se26  1  0.601  0.600  0.450  1.0
  Se  Se27  1  0.884  0.233  0.384  1.0
  Se  Se28  1  0.234  0.385  0.383  1.0
  Se  Se29  1  0.615  0.117  0.617  1.0
  Se  Se30  1  0.264  0.265  0.616  1.0
  Se  Se31  1  0.450  0.949  0.450  1.0
  Se  Se32  1  0.903  0.551  0.549  1.0
  Se  Se33  1  0.050  0.900  0.550  1.0
  Se  Se34  1  0.934  0.933  0.783  1.0
  Se  Se35  1  0.213  0.568  0.717  1.0
  Se  Se36  1  0.565  0.716  0.716  1.0
  Se  Se37  1  0.949  0.450  0.950  1.0
  Se  Se38  1  0.600  0.601  0.950  1.0
  Se  Se39  1  0.233  0.884  0.884  1.0
  Se  Se40  1  0.786  0.282  0.785  1.0
  Se  Se41  1  0.385  0.234  0.883  1.0
[/CIF]
.