Cr13Si2(SbO14)2 crystallizes in the triclinic P1 space group. There are thirteen inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(21), one O(25), one O(27), one O(5), and one O(6) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(13)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Cr(5)O5 trigonal bipyramids,  an edgeedge with one Cr(10)O5 trigonal bipyramid, and  an edgeedge with one Cr(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. In the second Cr site, Cr(2) is bonded to one O(1), one O(11), one O(14), one O(15), and one O(3) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(10)O5 trigonal bipyramid, corners with two equivalent Cr(4)O5 trigonal bipyramids,  an edgeedge with one Cr(11)O5 trigonal bipyramid, and  an edgeedge with one Cr(7)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 57-67°. In the third Cr site, Cr(3) is bonded to one O(22), one O(23), one O(24), one O(27), and one O(6) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(13)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Cr(10)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. In the fourth Cr site, Cr(4) is bonded to one O(1), one O(11), one O(12), one O(2), and one O(20) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(11)O5 trigonal bipyramid, and  an edgeedge with one Cr(7)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. In the fifth Cr site, Cr(5) is bonded to one O(16), one O(17), one O(22), one O(25), and one O(6) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Cr(7)O5 trigonal bipyramid, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(10)O5 trigonal bipyramid, and  an edgeedge with one Cr(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 57-67°. In the sixth Cr site, Cr(6) is bonded to one O(13), one O(19), one O(20), one O(26), one O(7), and one O(8) atom to form distorted CrO6 octahedra that share  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  an edgeedge with one Cr(9)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(13)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the seventh Cr site, Cr(7) is bonded to one O(10), one O(11), one O(12), one O(15), and one O(16) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Cr(5)O5 trigonal bipyramid, corners with two equivalent Cr(11)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 56-67°. In the eighth Cr site, Cr(8) is bonded to one O(10), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form distorted CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(12)O6 octahedra, and edges with two equivalent Cr(9)O6 octahedra. In the ninth Cr site, Cr(9) is bonded to one O(10), one O(14), one O(20), one O(26), one O(4), and one O(9) atom to form CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Cr(12)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Cr(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. In the tenth Cr site, Cr(10) is bonded to one O(18), one O(22), one O(25), one O(27), and one O(3) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(3)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 56-67°. In the eleventh Cr site, Cr(11) is bonded to one O(1), one O(12), one O(15), one O(26), and one O(28) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Cr(7)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-67°. In the twelfth Cr site, Cr(12) is bonded to one O(17), one O(18), one O(21), one O(23), one O(4), and one O(9) atom to form CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  an edgeedge with one Cr(13)O6 octahedra,  an edgeedge with one Cr(9)O6 octahedra, edges with two equivalent Cr(8)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. In the thirteenth Cr site, Cr(13) is bonded to one O(13), one O(19), one O(21), one O(23), one O(7), and one O(8) atom to form distorted CrO6 octahedra that share  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  an edgeedge with one Cr(12)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Cr(6)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(22), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid, corners with two equivalent Cr(10)O5 trigonal bipyramids, and corners with two equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 56-71°. In the second Si site, Si(2) is bonded to one O(15), one O(16), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(5)O5 trigonal bipyramids, and corners with two equivalent Cr(7)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 56-71°. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(14), one O(19), one O(20), one O(26), and one O(8) atom to form distorted SbO6 octahedra that share  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Cr(13)O6 octahedra,  an edgeedge with one Cr(8)O6 octahedra, edges with two equivalent Cr(6)O6 octahedra, and edges with two equivalent Cr(9)O6 octahedra. In the second Sb site, Sb(2) is bonded to one O(13), one O(17), one O(18), one O(21), one O(23), and one O(7) atom to form distorted SbO6 octahedra that share  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Cr(8)O6 octahedra, edges with two equivalent Cr(12)O6 octahedra, and edges with two equivalent Cr(13)O6 octahedra. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cr(11), one Cr(2), and one Cr(4) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cr(10), one Cr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Cr(12), one Cr(8), one Cr(9), and one Si(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cr(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Cr(1), one Cr(3), and one Cr(5) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Cr(12), one Cr(8), one Cr(9), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Cr(7), one Cr(8), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(26)Cr3Sb tetrahedra,  an edgeedge with one O(14)Cr3Sb tetrahedra, and  an edgeedge with one O(20)Cr3Sb tetrahedra. In the eleventh O site, O(11) is bonded to one Cr(2), one Cr(4), one Cr(7), and one Si(1) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(20)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra, and  an edgeedge with one O(15)Cr3Si tetrahedra. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Cr(11), one Cr(4), and one Cr(7) atom. In the thirteenth O site, O(13) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(2) atom. In the fourteenth O site, O(14) is bonded to one Cr(2), one Cr(8), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(20)Cr3Sb tetrahedra,  an edgeedge with one O(10)Cr3Sb tetrahedra, and  an edgeedge with one O(26)Cr3Sb tetrahedra. In the fifteenth O site, O(15) is bonded to one Cr(11), one Cr(2), one Cr(7), and one Si(2) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(26)Cr3Sb tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, and  an edgeedge with one O(11)Cr3Si tetrahedra. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Cr(5), one Cr(7), and one Si(2) atom. In the seventeenth O site, O(17) is bonded to one Cr(12), one Cr(5), one Cr(8), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(21)Cr3Sb tetrahedra,  an edgeedge with one O(18)Cr3Sb tetrahedra, and  an edgeedge with one O(23)Cr3Sb tetrahedra. In the eighteenth O site, O(18) is bonded to one Cr(10), one Cr(12), one Cr(8), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(23)Cr3Sb tetrahedra,  an edgeedge with one O(17)Cr3Sb tetrahedra, and  an edgeedge with one O(21)Cr3Sb tetrahedra. In the nineteenth O site, O(19) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(1) atom. In the twentieth O site, O(20) is bonded to one Cr(4), one Cr(6), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(26)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra, corners with two equivalent O(14)Cr3Sb tetrahedra,  an edgeedge with one O(10)Cr3Sb tetrahedra, and  an edgeedge with one O(26)Cr3Sb tetrahedra. In the twenty-first O site, O(21) is bonded to one Cr(1), one Cr(12), one Cr(13), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(23)Cr3Sb tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(17)Cr3Sb tetrahedra,  an edgeedge with one O(18)Cr3Sb tetrahedra, and  an edgeedge with one O(23)Cr3Sb tetrahedra. In the twenty-second O site, O(22) is bonded to one Cr(10), one Cr(3), one Cr(5), and one Si(1) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(23)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra, and  an edgeedge with one O(25)Cr3Si tetrahedra. In the twenty-third O site, O(23) is bonded to one Cr(12), one Cr(13), one Cr(3), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(21)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra, corners with two equivalent O(18)Cr3Sb tetrahedra,  an edgeedge with one O(17)Cr3Sb tetrahedra, and  an edgeedge with one O(21)Cr3Sb tetrahedra. In the twenty-fourth O site, O(24) is bonded in a single-bond geometry to one Cr(3) atom. In the twenty-fifth O site, O(25) is bonded to one Cr(1), one Cr(10), one Cr(5), and one Si(2) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(21)Cr3Sb tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, and  an edgeedge with one O(22)Cr3Si tetrahedra. In the twenty-sixth O site, O(26) is bonded to one Cr(11), one Cr(6), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(20)Cr3Sb tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(10)Cr3Sb tetrahedra,  an edgeedge with one O(14)Cr3Sb tetrahedra, and  an edgeedge with one O(20)Cr3Sb tetrahedra. In the twenty-seventh O site, O(27) is bonded in a trigonal non-coplanar geometry to one Cr(1), one Cr(10), and one Cr(3) atom. In the twenty-eighth O site, O(28) is bonded in a single-bond geometry to one Cr(11) atom.
Cr13Si2(SbO14)2 crystallizes in the triclinic P1 space group. There are thirteen inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(21), one O(25), one O(27), one O(5), and one O(6) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(13)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Cr(5)O5 trigonal bipyramids,  an edgeedge with one Cr(10)O5 trigonal bipyramid, and  an edgeedge with one Cr(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. The Cr(1)-O(21) bond length is 2.10 Å. The Cr(1)-O(25) bond length is 2.29 Å. The Cr(1)-O(27) bond length is 2.00 Å. The Cr(1)-O(5) bond length is 1.60 Å. The Cr(1)-O(6) bond length is 1.93 Å. In the second Cr site, Cr(2) is bonded to one O(1), one O(11), one O(14), one O(15), and one O(3) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(10)O5 trigonal bipyramid, corners with two equivalent Cr(4)O5 trigonal bipyramids,  an edgeedge with one Cr(11)O5 trigonal bipyramid, and  an edgeedge with one Cr(7)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 57-67°. The Cr(2)-O(1) bond length is 1.96 Å. The Cr(2)-O(11) bond length is 2.11 Å. The Cr(2)-O(14) bond length is 1.98 Å. The Cr(2)-O(15) bond length is 2.14 Å. The Cr(2)-O(3) bond length is 2.04 Å. In the third Cr site, Cr(3) is bonded to one O(22), one O(23), one O(24), one O(27), and one O(6) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(13)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Cr(10)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. The Cr(3)-O(22) bond length is 2.28 Å. The Cr(3)-O(23) bond length is 2.11 Å. The Cr(3)-O(24) bond length is 1.60 Å. The Cr(3)-O(27) bond length is 1.95 Å. The Cr(3)-O(6) bond length is 1.98 Å. In the fourth Cr site, Cr(4) is bonded to one O(1), one O(11), one O(12), one O(2), and one O(20) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(11)O5 trigonal bipyramid, and  an edgeedge with one Cr(7)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 50-67°. The Cr(4)-O(1) bond length is 1.93 Å. The Cr(4)-O(11) bond length is 2.30 Å. The Cr(4)-O(12) bond length is 2.00 Å. The Cr(4)-O(2) bond length is 1.60 Å. The Cr(4)-O(20) bond length is 2.10 Å. In the fifth Cr site, Cr(5) is bonded to one O(16), one O(17), one O(22), one O(25), and one O(6) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Cr(7)O5 trigonal bipyramid, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(10)O5 trigonal bipyramid, and  an edgeedge with one Cr(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 57-67°. The Cr(5)-O(16) bond length is 2.04 Å. The Cr(5)-O(17) bond length is 1.98 Å. The Cr(5)-O(22) bond length is 2.13 Å. The Cr(5)-O(25) bond length is 2.12 Å. The Cr(5)-O(6) bond length is 1.96 Å. In the sixth Cr site, Cr(6) is bonded to one O(13), one O(19), one O(20), one O(26), one O(7), and one O(8) atom to form distorted CrO6 octahedra that share  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  an edgeedge with one Cr(9)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(13)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The Cr(6)-O(13) bond length is 2.04 Å. The Cr(6)-O(19) bond length is 2.05 Å. The Cr(6)-O(20) bond length is 2.18 Å. The Cr(6)-O(26) bond length is 2.17 Å. The Cr(6)-O(7) bond length is 2.03 Å. The Cr(6)-O(8) bond length is 2.05 Å. In the seventh Cr site, Cr(7) is bonded to one O(10), one O(11), one O(12), one O(15), and one O(16) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  a cornercorner with one Cr(5)O5 trigonal bipyramid, corners with two equivalent Cr(11)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 56-67°. The Cr(7)-O(10) bond length is 1.97 Å. The Cr(7)-O(11) bond length is 2.13 Å. The Cr(7)-O(12) bond length is 1.94 Å. The Cr(7)-O(15) bond length is 2.12 Å. The Cr(7)-O(16) bond length is 1.99 Å. In the eighth Cr site, Cr(8) is bonded to one O(10), one O(14), one O(17), one O(18), one O(4), and one O(9) atom to form distorted CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Sb(1)O6 octahedra,  an edgeedge with one Sb(2)O6 octahedra, edges with two equivalent Cr(12)O6 octahedra, and edges with two equivalent Cr(9)O6 octahedra. The Cr(8)-O(10) bond length is 2.12 Å. The Cr(8)-O(14) bond length is 2.12 Å. The Cr(8)-O(17) bond length is 2.12 Å. The Cr(8)-O(18) bond length is 2.13 Å. The Cr(8)-O(4) bond length is 2.47 Å. The Cr(8)-O(9) bond length is 2.47 Å. In the ninth Cr site, Cr(9) is bonded to one O(10), one O(14), one O(20), one O(26), one O(4), and one O(9) atom to form CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Cr(12)O6 octahedra,  an edgeedge with one Cr(6)O6 octahedra, edges with two equivalent Cr(8)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The Cr(9)-O(10) bond length is 2.04 Å. The Cr(9)-O(14) bond length is 2.03 Å. The Cr(9)-O(20) bond length is 2.04 Å. The Cr(9)-O(26) bond length is 2.03 Å. The Cr(9)-O(4) bond length is 2.09 Å. The Cr(9)-O(9) bond length is 2.09 Å. In the tenth Cr site, Cr(10) is bonded to one O(18), one O(22), one O(25), one O(27), and one O(3) atom to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Sb(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(3)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(5)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 56-67°. The Cr(10)-O(18) bond length is 1.97 Å. The Cr(10)-O(22) bond length is 2.11 Å. The Cr(10)-O(25) bond length is 2.13 Å. The Cr(10)-O(27) bond length is 1.94 Å. The Cr(10)-O(3) bond length is 2.00 Å. In the eleventh Cr site, Cr(11) is bonded to one O(1), one O(12), one O(15), one O(26), and one O(28) atom to form distorted CrO5 trigonal bipyramids that share  a cornercorner with one Cr(6)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Cr(7)O5 trigonal bipyramids,  an edgeedge with one Cr(2)O5 trigonal bipyramid, and  an edgeedge with one Cr(4)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 51-67°. The Cr(11)-O(1) bond length is 1.97 Å. The Cr(11)-O(12) bond length is 1.94 Å. The Cr(11)-O(15) bond length is 2.26 Å. The Cr(11)-O(26) bond length is 2.11 Å. The Cr(11)-O(28) bond length is 1.60 Å. In the twelfth Cr site, Cr(12) is bonded to one O(17), one O(18), one O(21), one O(23), one O(4), and one O(9) atom to form CrO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  an edgeedge with one Cr(13)O6 octahedra,  an edgeedge with one Cr(9)O6 octahedra, edges with two equivalent Cr(8)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The Cr(12)-O(17) bond length is 2.03 Å. The Cr(12)-O(18) bond length is 2.04 Å. The Cr(12)-O(21) bond length is 2.04 Å. The Cr(12)-O(23) bond length is 2.04 Å. The Cr(12)-O(4) bond length is 2.09 Å. The Cr(12)-O(9) bond length is 2.09 Å. In the thirteenth Cr site, Cr(13) is bonded to one O(13), one O(19), one O(21), one O(23), one O(7), and one O(8) atom to form distorted CrO6 octahedra that share  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  an edgeedge with one Cr(12)O6 octahedra,  an edgeedge with one Sb(1)O6 octahedra, edges with two equivalent Cr(6)O6 octahedra, and edges with two equivalent Sb(2)O6 octahedra. The Cr(13)-O(13) bond length is 2.05 Å. The Cr(13)-O(19) bond length is 2.04 Å. The Cr(13)-O(21) bond length is 2.18 Å. The Cr(13)-O(23) bond length is 2.18 Å. The Cr(13)-O(7) bond length is 2.05 Å. The Cr(13)-O(8) bond length is 2.03 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(22), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid, corners with two equivalent Cr(10)O5 trigonal bipyramids, and corners with two equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 56-71°. The Si(1)-O(11) bond length is 1.66 Å. The Si(1)-O(22) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.63 Å. In the second Si site, Si(2) is bonded to one O(15), one O(16), one O(25), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Cr(12)O6 octahedra,  a cornercorner with one Cr(8)O6 octahedra,  a cornercorner with one Cr(9)O6 octahedra,  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(5)O5 trigonal bipyramids, and corners with two equivalent Cr(7)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 56-71°. The Si(2)-O(15) bond length is 1.66 Å. The Si(2)-O(16) bond length is 1.63 Å. The Si(2)-O(25) bond length is 1.66 Å. The Si(2)-O(9) bond length is 1.63 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(10), one O(14), one O(19), one O(20), one O(26), and one O(8) atom to form distorted SbO6 octahedra that share  a cornercorner with one Cr(11)O5 trigonal bipyramid,  a cornercorner with one Cr(2)O5 trigonal bipyramid,  a cornercorner with one Cr(4)O5 trigonal bipyramid,  a cornercorner with one Cr(7)O5 trigonal bipyramid,  an edgeedge with one Cr(13)O6 octahedra,  an edgeedge with one Cr(8)O6 octahedra, edges with two equivalent Cr(6)O6 octahedra, and edges with two equivalent Cr(9)O6 octahedra. The Sb(1)-O(10) bond length is 2.35 Å. The Sb(1)-O(14) bond length is 2.34 Å. The Sb(1)-O(19) bond length is 2.03 Å. The Sb(1)-O(20) bond length is 2.29 Å. The Sb(1)-O(26) bond length is 2.30 Å. The Sb(1)-O(8) bond length is 2.03 Å. In the second Sb site, Sb(2) is bonded to one O(13), one O(17), one O(18), one O(21), one O(23), and one O(7) atom to form distorted SbO6 octahedra that share  a cornercorner with one Cr(1)O5 trigonal bipyramid,  a cornercorner with one Cr(10)O5 trigonal bipyramid,  a cornercorner with one Cr(3)O5 trigonal bipyramid,  a cornercorner with one Cr(5)O5 trigonal bipyramid,  an edgeedge with one Cr(6)O6 octahedra,  an edgeedge with one Cr(8)O6 octahedra, edges with two equivalent Cr(12)O6 octahedra, and edges with two equivalent Cr(13)O6 octahedra. The Sb(2)-O(13) bond length is 2.03 Å. The Sb(2)-O(17) bond length is 2.34 Å. The Sb(2)-O(18) bond length is 2.35 Å. The Sb(2)-O(21) bond length is 2.30 Å. The Sb(2)-O(23) bond length is 2.29 Å. The Sb(2)-O(7) bond length is 2.03 Å. There are twenty-eight inequivalent O sites. In the first O site, O(1) is bonded in a trigonal non-coplanar geometry to one Cr(11), one Cr(2), and one Cr(4) atom. In the second O site, O(2) is bonded in a single-bond geometry to one Cr(4) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Cr(10), one Cr(2), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Cr(12), one Cr(8), one Cr(9), and one Si(1) atom. In the fifth O site, O(5) is bonded in a single-bond geometry to one Cr(1) atom. In the sixth O site, O(6) is bonded in a trigonal non-coplanar geometry to one Cr(1), one Cr(3), and one Cr(5) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(1) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Cr(12), one Cr(8), one Cr(9), and one Si(2) atom. In the tenth O site, O(10) is bonded to one Cr(7), one Cr(8), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(26)Cr3Sb tetrahedra,  an edgeedge with one O(14)Cr3Sb tetrahedra, and  an edgeedge with one O(20)Cr3Sb tetrahedra. In the eleventh O site, O(11) is bonded to one Cr(2), one Cr(4), one Cr(7), and one Si(1) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(20)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra, and  an edgeedge with one O(15)Cr3Si tetrahedra. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Cr(11), one Cr(4), and one Cr(7) atom. In the thirteenth O site, O(13) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(2) atom. In the fourteenth O site, O(14) is bonded to one Cr(2), one Cr(8), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(20)Cr3Sb tetrahedra,  an edgeedge with one O(10)Cr3Sb tetrahedra, and  an edgeedge with one O(26)Cr3Sb tetrahedra. In the fifteenth O site, O(15) is bonded to one Cr(11), one Cr(2), one Cr(7), and one Si(2) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(26)Cr3Sb tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, and  an edgeedge with one O(11)Cr3Si tetrahedra. In the sixteenth O site, O(16) is bonded in a distorted trigonal planar geometry to one Cr(5), one Cr(7), and one Si(2) atom. In the seventeenth O site, O(17) is bonded to one Cr(12), one Cr(5), one Cr(8), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(21)Cr3Sb tetrahedra,  an edgeedge with one O(18)Cr3Sb tetrahedra, and  an edgeedge with one O(23)Cr3Sb tetrahedra. In the eighteenth O site, O(18) is bonded to one Cr(10), one Cr(12), one Cr(8), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(10)Cr3Sb tetrahedra,  a cornercorner with one O(14)Cr3Sb tetrahedra,  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(23)Cr3Sb tetrahedra,  an edgeedge with one O(17)Cr3Sb tetrahedra, and  an edgeedge with one O(21)Cr3Sb tetrahedra. In the nineteenth O site, O(19) is bonded in a trigonal non-coplanar geometry to one Cr(13), one Cr(6), and one Sb(1) atom. In the twentieth O site, O(20) is bonded to one Cr(4), one Cr(6), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(26)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra, corners with two equivalent O(14)Cr3Sb tetrahedra,  an edgeedge with one O(10)Cr3Sb tetrahedra, and  an edgeedge with one O(26)Cr3Sb tetrahedra. In the twenty-first O site, O(21) is bonded to one Cr(1), one Cr(12), one Cr(13), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(23)Cr3Sb tetrahedra,  a cornercorner with one O(25)Cr3Si tetrahedra, corners with two equivalent O(17)Cr3Sb tetrahedra,  an edgeedge with one O(18)Cr3Sb tetrahedra, and  an edgeedge with one O(23)Cr3Sb tetrahedra. In the twenty-second O site, O(22) is bonded to one Cr(10), one Cr(3), one Cr(5), and one Si(1) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(23)Cr3Sb tetrahedra,  a cornercorner with one O(11)Cr3Si tetrahedra, and  an edgeedge with one O(25)Cr3Si tetrahedra. In the twenty-third O site, O(23) is bonded to one Cr(12), one Cr(13), one Cr(3), and one Sb(2) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(21)Cr3Sb tetrahedra,  a cornercorner with one O(22)Cr3Si tetrahedra, corners with two equivalent O(18)Cr3Sb tetrahedra,  an edgeedge with one O(17)Cr3Sb tetrahedra, and  an edgeedge with one O(21)Cr3Sb tetrahedra. In the twenty-fourth O site, O(24) is bonded in a single-bond geometry to one Cr(3) atom. In the twenty-fifth O site, O(25) is bonded to one Cr(1), one Cr(10), one Cr(5), and one Si(2) atom to form distorted OCr3Si tetrahedra that share  a cornercorner with one O(17)Cr3Sb tetrahedra,  a cornercorner with one O(18)Cr3Sb tetrahedra,  a cornercorner with one O(21)Cr3Sb tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, and  an edgeedge with one O(22)Cr3Si tetrahedra. In the twenty-sixth O site, O(26) is bonded to one Cr(11), one Cr(6), one Cr(9), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(20)Cr3Sb tetrahedra,  a cornercorner with one O(15)Cr3Si tetrahedra, corners with two equivalent O(10)Cr3Sb tetrahedra,  an edgeedge with one O(14)Cr3Sb tetrahedra, and  an edgeedge with one O(20)Cr3Sb tetrahedra. In the twenty-seventh O site, O(27) is bonded in a trigonal non-coplanar geometry to one Cr(1), one Cr(10), and one Cr(3) atom. In the twenty-eighth O site, O(28) is bonded in a single-bond geometry to one Cr(11) atom.