SrCr10O15 crystallizes in the orthorhombic Cmce space group. Sr(1) is bonded to two equivalent O(2), two equivalent O(3), four equivalent O(5), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with eight equivalent Cr(2)O6 octahedra, corners with eight equivalent Cr(3)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Cr(2)O6 octahedra, faces with two equivalent Cr(1)O6 octahedra, and faces with four equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-50°. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with four equivalent Cr(3)O6 octahedra,  an edgeedge with one Sr(1)O12 cuboctahedra, edges with two equivalent Cr(3)O6 octahedra, edges with four equivalent Cr(2)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-58°. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Sr(1)O12 cuboctahedra, edges with two equivalent Cr(1)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with three equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-63°. In the third Cr site, Cr(3) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Cr(3)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra, edges with three equivalent Cr(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, and  a faceface with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-51°. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Cr(1), one Cr(2), and two equivalent Cr(3) atoms. In the second O site, O(1) is bonded to two equivalent Cr(1) and four equivalent Cr(2) atoms to form OCr6 octahedra that share corners with two equivalent O(3)SrCr3 tetrahedra, edges with two equivalent O(3)SrCr3 tetrahedra, edges with two equivalent O(2)SrCr4 trigonal bipyramids, and edges with four equivalent O(5)SrCr4 trigonal pyramids. In the third O site, O(2) is bonded to one Sr(1), two equivalent Cr(2), and two equivalent Cr(3) atoms to form distorted OSrCr4 trigonal bipyramids that share corners with four equivalent O(3)SrCr3 tetrahedra,  a cornercorner with one O(2)SrCr4 trigonal bipyramid, corners with two equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra, and edges with four equivalent O(5)SrCr4 trigonal pyramids. In the fourth O site, O(3) is bonded to one Sr(1), one Cr(1), and two equivalent Cr(2) atoms to form distorted OSrCr3 tetrahedra that share  a cornercorner with one O(1)Cr6 octahedra,  a cornercorner with one O(3)SrCr3 tetrahedra, corners with four equivalent O(2)SrCr4 trigonal bipyramids, corners with four equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra, and edges with two equivalent O(5)SrCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 7°. In the fifth O site, O(4) is bonded in a distorted see-saw-like geometry to two equivalent Cr(2) and two equivalent Cr(3) atoms. In the sixth O site, O(5) is bonded to one Sr(1), one Cr(1), one Cr(2), and two equivalent Cr(3) atoms to form distorted OSrCr4 trigonal pyramids that share corners with two equivalent O(3)SrCr3 tetrahedra,  a cornercorner with one O(2)SrCr4 trigonal bipyramid, corners with two equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra,  an edgeedge with one O(3)SrCr3 tetrahedra, edges with two equivalent O(2)SrCr4 trigonal bipyramids, and edges with two equivalent O(5)SrCr4 trigonal pyramids.
SrCr10O15 crystallizes in the orthorhombic Cmce space group. Sr(1) is bonded to two equivalent O(2), two equivalent O(3), four equivalent O(5), and four equivalent O(6) atoms to form distorted SrO12 cuboctahedra that share corners with eight equivalent Cr(2)O6 octahedra, corners with eight equivalent Cr(3)O6 octahedra, edges with two equivalent Cr(1)O6 octahedra, edges with four equivalent Cr(2)O6 octahedra, faces with two equivalent Cr(1)O6 octahedra, and faces with four equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 18-50°. Both Sr(1)-O(2) bond lengths are 2.97 Å. Both Sr(1)-O(3) bond lengths are 2.64 Å. All Sr(1)-O(5) bond lengths are 3.06 Å. All Sr(1)-O(6) bond lengths are 3.17 Å. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with four equivalent Cr(3)O6 octahedra,  an edgeedge with one Sr(1)O12 cuboctahedra, edges with two equivalent Cr(3)O6 octahedra, edges with four equivalent Cr(2)O6 octahedra, and  a faceface with one Sr(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-58°. The Cr(1)-O(1) bond length is 2.32 Å. The Cr(1)-O(3) bond length is 2.06 Å. Both Cr(1)-O(5) bond lengths are 2.09 Å. Both Cr(1)-O(6) bond lengths are 2.09 Å. In the second Cr site, Cr(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form CrO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra, corners with two equivalent Cr(3)O6 octahedra,  an edgeedge with one Sr(1)O12 cuboctahedra, edges with two equivalent Cr(1)O6 octahedra, edges with two equivalent Cr(2)O6 octahedra, and edges with three equivalent Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 0-63°. The Cr(2)-O(1) bond length is 2.21 Å. The Cr(2)-O(2) bond length is 2.15 Å. The Cr(2)-O(3) bond length is 1.98 Å. The Cr(2)-O(4) bond length is 2.05 Å. The Cr(2)-O(5) bond length is 2.05 Å. The Cr(2)-O(6) bond length is 2.06 Å. In the third Cr site, Cr(3) is bonded to one O(2), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form CrO6 octahedra that share corners with two equivalent Sr(1)O12 cuboctahedra,  a cornercorner with one Cr(3)O6 octahedra, corners with two equivalent Cr(1)O6 octahedra, corners with two equivalent Cr(2)O6 octahedra,  an edgeedge with one Cr(1)O6 octahedra,  an edgeedge with one Cr(3)O6 octahedra, edges with three equivalent Cr(2)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra, and  a faceface with one Cr(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 7-51°. The Cr(3)-O(2) bond length is 2.02 Å. The Cr(3)-O(4) bond length is 2.06 Å. Both Cr(3)-O(5) bond lengths are 2.04 Å. There is one shorter (2.00 Å) and one longer (2.02 Å) Cr(3)-O(6) bond length. There are six inequivalent O sites. In the first O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Sr(1), one Cr(1), one Cr(2), and two equivalent Cr(3) atoms. In the second O site, O(1) is bonded to two equivalent Cr(1) and four equivalent Cr(2) atoms to form OCr6 octahedra that share corners with two equivalent O(3)SrCr3 tetrahedra, edges with two equivalent O(3)SrCr3 tetrahedra, edges with two equivalent O(2)SrCr4 trigonal bipyramids, and edges with four equivalent O(5)SrCr4 trigonal pyramids. In the third O site, O(2) is bonded to one Sr(1), two equivalent Cr(2), and two equivalent Cr(3) atoms to form distorted OSrCr4 trigonal bipyramids that share corners with four equivalent O(3)SrCr3 tetrahedra,  a cornercorner with one O(2)SrCr4 trigonal bipyramid, corners with two equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra, and edges with four equivalent O(5)SrCr4 trigonal pyramids. In the fourth O site, O(3) is bonded to one Sr(1), one Cr(1), and two equivalent Cr(2) atoms to form distorted OSrCr3 tetrahedra that share  a cornercorner with one O(1)Cr6 octahedra,  a cornercorner with one O(3)SrCr3 tetrahedra, corners with four equivalent O(2)SrCr4 trigonal bipyramids, corners with four equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra, and edges with two equivalent O(5)SrCr4 trigonal pyramids. The corner-sharing octahedral tilt angles are 7°. In the fifth O site, O(4) is bonded in a distorted see-saw-like geometry to two equivalent Cr(2) and two equivalent Cr(3) atoms. In the sixth O site, O(5) is bonded to one Sr(1), one Cr(1), one Cr(2), and two equivalent Cr(3) atoms to form distorted OSrCr4 trigonal pyramids that share corners with two equivalent O(3)SrCr3 tetrahedra,  a cornercorner with one O(2)SrCr4 trigonal bipyramid, corners with two equivalent O(5)SrCr4 trigonal pyramids,  an edgeedge with one O(1)Cr6 octahedra,  an edgeedge with one O(3)SrCr3 tetrahedra, edges with two equivalent O(2)SrCr4 trigonal bipyramids, and edges with two equivalent O(5)SrCr4 trigonal pyramids.