Cr13Al4Si2(SbO14)2 is Aluminum carbonitride-derived structured and crystallizes in the monoclinic C2/m space group. There are five inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 58-65°. In the second Cr site, Cr(2) is bonded to one O(1), one O(3), one O(6), and two equivalent O(7) atoms to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 59-67°. In the third Cr site, Cr(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form CrO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Cr(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. In the fourth Cr site, Cr(4) is bonded in a 6-coordinate geometry to two equivalent O(4) and four equivalent O(6) atoms. In the fifth Cr site, Cr(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form CrO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form distorted AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and corners with four equivalent Cr(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 60-65°. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share corners with two equivalent Cr(5)O6 octahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, and corners with six equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 55°. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form distorted SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Cr(2)O5 trigonal bipyramids, edges with two equivalent Cr(5)O6 octahedra, and edges with three equivalent Cr(3)O6 octahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(2), two equivalent Cr(1), and one Al(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cr(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Cr(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Cr(4), two equivalent Cr(5), and one Si(1) atom to form distorted OCr3Si trigonal pyramids that share corners with four equivalent O(6)Cr3Sb tetrahedra, corners with four equivalent O(8)Cr3Sb tetrahedra,  a cornercorner with one O(4)Cr3Si trigonal pyramid, edges with two equivalent O(6)Cr3Sb tetrahedra, and  an edgeedge with one O(4)Cr3Si trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Cr(3), one Al(1), and one Sb(1) atom to form distorted OAlCr2Sb tetrahedra that share corners with two equivalent O(6)Cr3Sb tetrahedra, corners with three equivalent O(5)AlCr2Sb tetrahedra, corners with four equivalent O(8)Cr3Sb tetrahedra,  an edgeedge with one O(8)Cr3Sb tetrahedra, and edges with two equivalent O(5)AlCr2Sb tetrahedra. In the sixth O site, O(6) is bonded to one Cr(2), one Cr(4), one Cr(5), and one Sb(1) atom to form OCr3Sb tetrahedra that share corners with two equivalent O(5)AlCr2Sb tetrahedra, corners with two equivalent O(8)Cr3Sb tetrahedra, corners with three equivalent O(6)Cr3Sb tetrahedra, corners with two equivalent O(4)Cr3Si trigonal pyramids,  an edgeedge with one O(6)Cr3Sb tetrahedra,  an edgeedge with one O(8)Cr3Sb tetrahedra, and  an edgeedge with one O(4)Cr3Si trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Cr(1), one Cr(3), one Cr(5), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(8)Cr3Sb tetrahedra, corners with two equivalent O(6)Cr3Sb tetrahedra, corners with four equivalent O(5)AlCr2Sb tetrahedra, corners with two equivalent O(4)Cr3Si trigonal pyramids,  an edgeedge with one O(5)AlCr2Sb tetrahedra,  an edgeedge with one O(6)Cr3Sb tetrahedra, and  an edgeedge with one O(8)Cr3Sb tetrahedra.
Cr13Al4Si2(SbO14)2 is Aluminum carbonitride-derived structured and crystallizes in the monoclinic C2/m space group. There are five inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(2), one O(7), one O(8), and two equivalent O(1) atoms to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(3)O6 octahedra,  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 58-65°. The Cr(1)-O(2) bond length is 2.12 Å. The Cr(1)-O(7) bond length is 2.08 Å. The Cr(1)-O(8) bond length is 2.06 Å. There is one shorter (2.09 Å) and one longer (2.47 Å) Cr(1)-O(1) bond length. In the second Cr site, Cr(2) is bonded to one O(1), one O(3), one O(6), and two equivalent O(7) atoms to form CrO5 trigonal bipyramids that share  a cornercorner with one Cr(5)O6 octahedra,  a cornercorner with one Sb(1)O6 octahedra,  a cornercorner with one Al(1)O4 tetrahedra, corners with three equivalent Si(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(1)O5 trigonal bipyramid, and  an edgeedge with one Cr(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 59-67°. The Cr(2)-O(1) bond length is 2.07 Å. The Cr(2)-O(3) bond length is 2.03 Å. The Cr(2)-O(6) bond length is 2.06 Å. There is one shorter (2.14 Å) and one longer (2.36 Å) Cr(2)-O(7) bond length. In the third Cr site, Cr(3) is bonded to two equivalent O(8) and four equivalent O(5) atoms to form CrO6 octahedra that share corners with four equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids,  an edgeedge with one Cr(5)O6 octahedra, edges with two equivalent Cr(3)O6 octahedra, and edges with three equivalent Sb(1)O6 octahedra. Both Cr(3)-O(8) bond lengths are 2.14 Å. There are two shorter (2.07 Å) and two longer (2.14 Å) Cr(3)-O(5) bond lengths. In the fourth Cr site, Cr(4) is bonded in a 6-coordinate geometry to two equivalent O(4) and four equivalent O(6) atoms. Both Cr(4)-O(4) bond lengths are 2.52 Å. All Cr(4)-O(6) bond lengths are 2.17 Å. In the fifth Cr site, Cr(5) is bonded to two equivalent O(4), two equivalent O(6), and two equivalent O(8) atoms to form CrO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Cr(2)O5 trigonal bipyramids,  an edgeedge with one Cr(3)O6 octahedra,  an edgeedge with one Cr(5)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. Both Cr(5)-O(4) bond lengths are 2.15 Å. Both Cr(5)-O(6) bond lengths are 2.04 Å. Both Cr(5)-O(8) bond lengths are 2.07 Å. Al(1) is bonded to one O(1), one O(5), and two equivalent O(2) atoms to form distorted AlO4 tetrahedra that share  a cornercorner with one Sb(1)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra, corners with two equivalent Al(1)O4 tetrahedra,  a cornercorner with one Cr(2)O5 trigonal bipyramid, and corners with four equivalent Cr(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 60-65°. The Al(1)-O(1) bond length is 1.78 Å. The Al(1)-O(5) bond length is 1.82 Å. There is one shorter (1.76 Å) and one longer (1.77 Å) Al(1)-O(2) bond length. Si(1) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form SiO4 tetrahedra that share corners with two equivalent Cr(5)O6 octahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, and corners with six equivalent Cr(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles are 55°. The Si(1)-O(3) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.66 Å. Both Si(1)-O(7) bond lengths are 1.68 Å. Sb(1) is bonded to two equivalent O(5), two equivalent O(6), and two equivalent O(8) atoms to form distorted SbO6 octahedra that share corners with two equivalent Al(1)O4 tetrahedra, corners with two equivalent Cr(1)O5 trigonal bipyramids, corners with two equivalent Cr(2)O5 trigonal bipyramids, edges with two equivalent Cr(5)O6 octahedra, and edges with three equivalent Cr(3)O6 octahedra. Both Sb(1)-O(5) bond lengths are 2.41 Å. Both Sb(1)-O(6) bond lengths are 2.18 Å. Both Sb(1)-O(8) bond lengths are 2.35 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Cr(2), two equivalent Cr(1), and one Al(1) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Cr(1) and two equivalent Al(1) atoms. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Cr(2) and one Si(1) atom. In the fourth O site, O(4) is bonded to one Cr(4), two equivalent Cr(5), and one Si(1) atom to form distorted OCr3Si trigonal pyramids that share corners with four equivalent O(6)Cr3Sb tetrahedra, corners with four equivalent O(8)Cr3Sb tetrahedra,  a cornercorner with one O(4)Cr3Si trigonal pyramid, edges with two equivalent O(6)Cr3Sb tetrahedra, and  an edgeedge with one O(4)Cr3Si trigonal pyramid. In the fifth O site, O(5) is bonded to two equivalent Cr(3), one Al(1), and one Sb(1) atom to form distorted OAlCr2Sb tetrahedra that share corners with two equivalent O(6)Cr3Sb tetrahedra, corners with three equivalent O(5)AlCr2Sb tetrahedra, corners with four equivalent O(8)Cr3Sb tetrahedra,  an edgeedge with one O(8)Cr3Sb tetrahedra, and edges with two equivalent O(5)AlCr2Sb tetrahedra. In the sixth O site, O(6) is bonded to one Cr(2), one Cr(4), one Cr(5), and one Sb(1) atom to form OCr3Sb tetrahedra that share corners with two equivalent O(5)AlCr2Sb tetrahedra, corners with two equivalent O(8)Cr3Sb tetrahedra, corners with three equivalent O(6)Cr3Sb tetrahedra, corners with two equivalent O(4)Cr3Si trigonal pyramids,  an edgeedge with one O(6)Cr3Sb tetrahedra,  an edgeedge with one O(8)Cr3Sb tetrahedra, and  an edgeedge with one O(4)Cr3Si trigonal pyramid. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Si(1) atom. In the eighth O site, O(8) is bonded to one Cr(1), one Cr(3), one Cr(5), and one Sb(1) atom to form distorted OCr3Sb tetrahedra that share  a cornercorner with one O(8)Cr3Sb tetrahedra, corners with two equivalent O(6)Cr3Sb tetrahedra, corners with four equivalent O(5)AlCr2Sb tetrahedra, corners with two equivalent O(4)Cr3Si trigonal pyramids,  an edgeedge with one O(5)AlCr2Sb tetrahedra,  an edgeedge with one O(6)Cr3Sb tetrahedra, and  an edgeedge with one O(8)Cr3Sb tetrahedra.