The material described by Li7Cr3(SiO6)2 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2 space group. There are seven inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the second Li site, Li(2) is bonded to one O(1), one O(10), one O(11), one O(4), one O(5), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, and edges with two equivalent Li(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the third Li site, Li(3) is bonded to one O(12), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, and edges with two equivalent Li(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the fourth Li site, Li(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, and edges with two equivalent Li(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the fifth Li site, Li(5) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, and edges with two equivalent Li(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the sixth Li site, Li(6) is bonded to one O(11), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, and edges with two equivalent Li(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the seventh Li site, Li(7) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, and edges with two equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. There are six inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(3)O6 octahedra, and edges with two equivalent Cr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Cr site, Cr(2) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(11) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the third Cr site, Cr(3) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Cr(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fourth Cr site, Cr(4) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fifth Cr site, Cr(5) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(2) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Cr(6)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the sixth Cr site, Cr(6) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(12) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Cr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), one Li(5), one Li(7), one Cr(2), one Cr(4), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(10)Li3Cr3 octahedra, and edges with three equivalent O(11)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the second O site, O(2) is bonded to one Li(3), one Li(4), one Li(6), one Cr(1), one Cr(3), and one Cr(5) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(12)Li3Cr3 octahedra, and edges with three equivalent O(9)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the third O site, O(3) is bonded to one Li(1), one Li(3), one Li(4), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, edges with two equivalent O(6)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Li(5), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, edges with two equivalent O(6)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the fifth O site, O(5) is bonded to one Li(1), one Li(2), one Li(5), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the sixth O site, O(6) is bonded to one Li(1), one Li(3), one Li(4), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the seventh O site, O(7) is bonded to one Li(1), one Li(2), one Li(4), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, and edges with two equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the eighth O site, O(8) is bonded to one Li(1), one Li(3), one Li(5), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, and edges with two equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the ninth O site, O(9) is bonded to one Li(3), one Li(5), one Li(6), one Cr(1), one Cr(3), and one Cr(4) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(11)Li3Cr3 octahedra, and edges with three equivalent O(2)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the tenth O site, O(10) is bonded to one Li(2), one Li(4), one Li(7), one Cr(2), one Cr(5), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(1)Li3Cr3 octahedra, and edges with three equivalent O(12)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the eleventh O site, O(11) is bonded to one Li(2), one Li(5), one Li(6), one Cr(2), one Cr(3), and one Cr(4) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(1)Li3Cr3 octahedra, and edges with three equivalent O(9)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the twelfth O site, O(12) is bonded to one Li(3), one Li(4), one Li(7), one Cr(1), one Cr(5), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(10)Li3Cr3 octahedra, and edges with three equivalent O(2)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li7Cr3(SiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.945
_cell_length_b   4.945
_cell_length_c   9.824
_cell_angle_alpha   94.811
_cell_angle_beta   94.814
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   205.093
_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
  Cr  Cr0  1  0.917  0.583  0.750  1.0
  Cr  Cr1  1  0.250  0.250  0.750  1.0
  Cr  Cr2  1  0.583  0.917  0.750  1.0
  Li  Li3  1  0.417  0.083  0.250  1.0
  Li  Li4  1  0.171  0.837  0.494  1.0
  Li  Li5  1  0.663  0.329  0.006  1.0
  Li  Li6  1  0.335  0.674  0.006  1.0
  Li  Li7  1  0.498  0.492  0.494  1.0
  Li  Li8  1  0.826  0.165  0.494  1.0
  Li  Li9  1  0.008  0.002  0.006  1.0
  O  O10  1  0.290  0.957  0.870  1.0
  O  O11  1  0.543  0.210  0.630  1.0
  O  O12  1  0.008  0.675  0.147  1.0
  O  O13  1  0.825  0.492  0.353  1.0
  O  O14  1  0.451  0.744  0.353  1.0
  O  O15  1  0.382  0.423  0.147  1.0
  O  O16  1  0.756  0.049  0.147  1.0
  O  O17  1  0.077  0.118  0.353  1.0
  O  O18  1  0.878  0.878  0.633  1.0
  O  O19  1  0.622  0.622  0.867  1.0
  O  O20  1  0.211  0.544  0.633  1.0
  O  O21  1  0.956  0.289  0.867  1.0
  Si  Si22  1  0.750  0.750  0.250  1.0
  Si  Si23  1  0.083  0.417  0.250  1.0
[/CIF]
.
The material described by Li7Cr3(SiO6)2 is Caswellsilverite-derived structured and crystallizes in the monoclinic C2 space group. There are seven inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form LiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Si(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 14°. In the second Li site, Li(2) is bonded to one O(1), one O(10), one O(11), one O(4), one O(5), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, and edges with two equivalent Li(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the third Li site, Li(3) is bonded to one O(12), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, and edges with two equivalent Li(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the fourth Li site, Li(4) is bonded to one O(10), one O(12), one O(2), one O(3), one O(6), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, and edges with two equivalent Li(7)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the fifth Li site, Li(5) is bonded to one O(1), one O(11), one O(4), one O(5), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, and edges with two equivalent Li(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the sixth Li site, Li(6) is bonded to one O(11), one O(2), one O(3), one O(5), one O(8), and one O(9) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(2)O6 octahedra,  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, and edges with two equivalent Li(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. In the seventh Li site, Li(7) is bonded to one O(1), one O(10), one O(12), one O(4), one O(6), and one O(7) atom to form LiO6 octahedra that share  a cornercorner with one Li(1)O6 octahedra,  a cornercorner with one Cr(1)O6 octahedra,  a cornercorner with one Cr(4)O6 octahedra,  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Si(1)O6 octahedra,  a cornercorner with one Si(2)O6 octahedra,  an edgeedge with one Li(1)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Si(1)O6 octahedra,  an edgeedge with one Si(2)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, and edges with two equivalent Li(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-14°. There are six inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to two equivalent O(12), two equivalent O(2), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(3)O6 octahedra, and edges with two equivalent Cr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second Cr site, Cr(2) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(11) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(4)O6 octahedra, and edges with two equivalent Cr(6)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the third Cr site, Cr(3) is bonded to two equivalent O(11), two equivalent O(2), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Cr(4)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fourth Cr site, Cr(4) is bonded to two equivalent O(1), two equivalent O(11), and two equivalent O(9) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(5)O6 octahedra, edges with two equivalent Li(6)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 4-5°. In the fifth Cr site, Cr(5) is bonded to two equivalent O(10), two equivalent O(12), and two equivalent O(2) atoms to form CrO6 octahedra that share corners with two equivalent Li(2)O6 octahedra, corners with two equivalent Li(4)O6 octahedra, corners with two equivalent Li(6)O6 octahedra,  an edgeedge with one Cr(2)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra, edges with two equivalent Li(3)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, and edges with two equivalent Cr(6)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the sixth Cr site, Cr(6) is bonded to two equivalent O(1), two equivalent O(10), and two equivalent O(12) atoms to form CrO6 octahedra that share corners with two equivalent Li(3)O6 octahedra, corners with two equivalent Li(5)O6 octahedra, corners with two equivalent Li(7)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(4)O6 octahedra, edges with two equivalent Li(2)O6 octahedra, edges with two equivalent Li(4)O6 octahedra, edges with two equivalent Li(7)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with two equivalent Cr(5)O6 octahedra. The corner-sharing octahedral tilt angles are 4°. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(2)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form SiO6 octahedra that share  a cornercorner with one Li(2)O6 octahedra,  a cornercorner with one Li(3)O6 octahedra,  a cornercorner with one Li(4)O6 octahedra,  a cornercorner with one Li(5)O6 octahedra,  a cornercorner with one Li(6)O6 octahedra,  a cornercorner with one Li(7)O6 octahedra,  an edgeedge with one Li(2)O6 octahedra,  an edgeedge with one Li(3)O6 octahedra,  an edgeedge with one Li(4)O6 octahedra,  an edgeedge with one Li(5)O6 octahedra,  an edgeedge with one Li(6)O6 octahedra,  an edgeedge with one Li(7)O6 octahedra, edges with three equivalent Li(1)O6 octahedra, and edges with three equivalent Si(1)O6 octahedra. The corner-sharing octahedral tilt angles are 12°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded to one Li(2), one Li(5), one Li(7), one Cr(2), one Cr(4), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(10)Li3Cr3 octahedra, and edges with three equivalent O(11)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the second O site, O(2) is bonded to one Li(3), one Li(4), one Li(6), one Cr(1), one Cr(3), and one Cr(5) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(12)Li3Cr3 octahedra, and edges with three equivalent O(9)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-4°. In the third O site, O(3) is bonded to one Li(1), one Li(3), one Li(4), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, edges with two equivalent O(6)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the fourth O site, O(4) is bonded to one Li(1), one Li(2), one Li(5), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, edges with two equivalent O(6)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the fifth O site, O(5) is bonded to one Li(1), one Li(2), one Li(5), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the sixth O site, O(6) is bonded to one Li(1), one Li(3), one Li(4), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(7)Li4Si2 octahedra, and edges with two equivalent O(8)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the seventh O site, O(7) is bonded to one Li(1), one Li(2), one Li(4), one Li(7), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, and edges with two equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the eighth O site, O(8) is bonded to one Li(1), one Li(3), one Li(5), one Li(6), one Si(1), and one Si(2) atom to form OLi4Si2 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with two equivalent O(3)Li4Si2 octahedra, edges with two equivalent O(4)Li4Si2 octahedra, edges with two equivalent O(5)Li4Si2 octahedra, and edges with two equivalent O(6)Li4Si2 octahedra. The corner-sharing octahedral tilt angles range from 0-11°. In the ninth O site, O(9) is bonded to one Li(3), one Li(5), one Li(6), one Cr(1), one Cr(3), and one Cr(4) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(11)Li3Cr3 octahedra, and edges with three equivalent O(2)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. In the tenth O site, O(10) is bonded to one Li(2), one Li(4), one Li(7), one Cr(2), one Cr(5), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(1)Li3Cr3 octahedra, and edges with three equivalent O(12)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the eleventh O site, O(11) is bonded to one Li(2), one Li(5), one Li(6), one Cr(2), one Cr(3), and one Cr(4) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(10)Li3Cr3 octahedra,  a cornercorner with one O(11)Li3Cr3 octahedra,  a cornercorner with one O(2)Li3Cr3 octahedra,  a cornercorner with one O(3)Li4Si2 octahedra,  a cornercorner with one O(5)Li4Si2 octahedra,  a cornercorner with one O(7)Li4Si2 octahedra,  an edgeedge with one O(10)Li3Cr3 octahedra,  an edgeedge with one O(11)Li3Cr3 octahedra,  an edgeedge with one O(2)Li3Cr3 octahedra,  an edgeedge with one O(4)Li4Si2 octahedra,  an edgeedge with one O(5)Li4Si2 octahedra,  an edgeedge with one O(8)Li4Si2 octahedra, edges with three equivalent O(1)Li3Cr3 octahedra, and edges with three equivalent O(9)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 1-6°. In the twelfth O site, O(12) is bonded to one Li(3), one Li(4), one Li(7), one Cr(1), one Cr(5), and one Cr(6) atom to form OLi3Cr3 octahedra that share  a cornercorner with one O(1)Li3Cr3 octahedra,  a cornercorner with one O(12)Li3Cr3 octahedra,  a cornercorner with one O(9)Li3Cr3 octahedra,  a cornercorner with one O(4)Li4Si2 octahedra,  a cornercorner with one O(6)Li4Si2 octahedra,  a cornercorner with one O(8)Li4Si2 octahedra,  an edgeedge with one O(1)Li3Cr3 octahedra,  an edgeedge with one O(12)Li3Cr3 octahedra,  an edgeedge with one O(9)Li3Cr3 octahedra,  an edgeedge with one O(3)Li4Si2 octahedra,  an edgeedge with one O(6)Li4Si2 octahedra,  an edgeedge with one O(7)Li4Si2 octahedra, edges with three equivalent O(10)Li3Cr3 octahedra, and edges with three equivalent O(2)Li3Cr3 octahedra. The corner-sharing octahedral tilt angles range from 0-6°. is represented by the Crystallographic Information File (CIF) [CIF]
data_Li7Cr3(SiO6)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.945
_cell_length_b   4.945
_cell_length_c   9.824
_cell_angle_alpha   94.811
_cell_angle_beta   94.814
_cell_angle_gamma   119.998
_symmetry_Int_Tables_number   1
_cell_volume   205.093
_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
  Cr  Cr0  1  0.917  0.583  0.750  1.0
  Cr  Cr1  1  0.250  0.250  0.750  1.0
  Cr  Cr2  1  0.583  0.917  0.750  1.0
  Li  Li3  1  0.417  0.083  0.250  1.0
  Li  Li4  1  0.171  0.837  0.494  1.0
  Li  Li5  1  0.663  0.329  0.006  1.0
  Li  Li6  1  0.335  0.674  0.006  1.0
  Li  Li7  1  0.498  0.492  0.494  1.0
  Li  Li8  1  0.826  0.165  0.494  1.0
  Li  Li9  1  0.008  0.002  0.006  1.0
  O  O10  1  0.290  0.957  0.870  1.0
  O  O11  1  0.543  0.210  0.630  1.0
  O  O12  1  0.008  0.675  0.147  1.0
  O  O13  1  0.825  0.492  0.353  1.0
  O  O14  1  0.451  0.744  0.353  1.0
  O  O15  1  0.382  0.423  0.147  1.0
  O  O16  1  0.756  0.049  0.147  1.0
  O  O17  1  0.077  0.118  0.353  1.0
  O  O18  1  0.878  0.878  0.633  1.0
  O  O19  1  0.622  0.622  0.867  1.0
  O  O20  1  0.211  0.544  0.633  1.0
  O  O21  1  0.956  0.289  0.867  1.0
  Si  Si22  1  0.750  0.750  0.250  1.0
  Si  Si23  1  0.083  0.417  0.250  1.0
[/CIF]
.