SrCa7Mn8O24 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Pm-3m space group. Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Ca(2)O12 cuboctahedra, faces with six equivalent Ca(1)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ca(2)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. In the second Ca site, Ca(2) is bonded to four equivalent O(1) and eight equivalent O(2) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Ca(2)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. In the third Ca site, Ca(3) is bonded to twelve equivalent O(2) atoms to form CaO12 cuboctahedra that share corners with twelve equivalent Ca(1)O12 cuboctahedra, faces with six equivalent Ca(2)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra, faces with three equivalent Ca(1)O12 cuboctahedra, and faces with three equivalent Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(1), one Ca(3), two equivalent Ca(2), and two equivalent Mn(1) atoms.
SrCa7Mn8O24 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Pm-3m space group. Sr(1) is bonded to twelve equivalent O(1) atoms to form SrO12 cuboctahedra that share corners with twelve equivalent Ca(2)O12 cuboctahedra, faces with six equivalent Ca(1)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. All Sr(1)-O(1) bond lengths are 2.71 Å. There are three inequivalent Ca sites. In the first Ca site, Ca(1) is bonded to four equivalent O(2) and eight equivalent O(1) atoms to form CaO12 cuboctahedra that share corners with four equivalent Ca(3)O12 cuboctahedra, corners with eight equivalent Ca(1)O12 cuboctahedra, faces with two equivalent Sr(1)O12 cuboctahedra, faces with four equivalent Ca(2)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. All Ca(1)-O(2) bond lengths are 2.69 Å. All Ca(1)-O(1) bond lengths are 2.69 Å. In the second Ca site, Ca(2) is bonded to four equivalent O(1) and eight equivalent O(2) atoms to form CaO12 cuboctahedra that share corners with four equivalent Sr(1)O12 cuboctahedra, corners with eight equivalent Ca(2)O12 cuboctahedra, faces with two equivalent Ca(3)O12 cuboctahedra, faces with four equivalent Ca(1)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. All Ca(2)-O(1) bond lengths are 2.67 Å. All Ca(2)-O(2) bond lengths are 2.69 Å. In the third Ca site, Ca(3) is bonded to twelve equivalent O(2) atoms to form CaO12 cuboctahedra that share corners with twelve equivalent Ca(1)O12 cuboctahedra, faces with six equivalent Ca(2)O12 cuboctahedra, and faces with eight equivalent Mn(1)O6 octahedra. All Ca(3)-O(2) bond lengths are 2.69 Å. Mn(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form MnO6 octahedra that share corners with six equivalent Mn(1)O6 octahedra,  a faceface with one Sr(1)O12 cuboctahedra,  a faceface with one Ca(3)O12 cuboctahedra, faces with three equivalent Ca(1)O12 cuboctahedra, and faces with three equivalent Ca(2)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 0-1°. All Mn(1)-O(1) bond lengths are 1.91 Å. All Mn(1)-O(2) bond lengths are 1.90 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted linear geometry to one Sr(1), one Ca(2), two equivalent Ca(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a distorted linear geometry to one Ca(1), one Ca(3), two equivalent Ca(2), and two equivalent Mn(1) atoms.