Al2Sn2O7 crystallizes in the cubic Fd-3m space group. Al(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Sn(1) is bonded to six equivalent O(2) atoms to form distorted corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 62°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Al(1) atoms to form OAl4 tetrahedra that share corners with four equivalent O(1)Al4 tetrahedra, corners with twelve equivalent O(2)Al2Sn2 tetrahedra, and edges with six equivalent O(2)Al2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Al(1) and two equivalent Sn(1) atoms to form OAl2Sn2 tetrahedra that share corners with two equivalent O(1)Al4 tetrahedra, corners with twelve equivalent O(2)Al2Sn2 tetrahedra,  an edgeedge with one O(1)Al4 tetrahedra, and edges with four equivalent O(2)Al2Sn2 tetrahedra.
Al2Sn2O7 crystallizes in the cubic Fd-3m space group. Al(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Al(1)-O(1) bond lengths are 2.15 Å. All Al(1)-O(2) bond lengths are 2.26 Å. Sn(1) is bonded to six equivalent O(2) atoms to form distorted corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 62°. All Sn(1)-O(2) bond lengths are 2.05 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Al(1) atoms to form OAl4 tetrahedra that share corners with four equivalent O(1)Al4 tetrahedra, corners with twelve equivalent O(2)Al2Sn2 tetrahedra, and edges with six equivalent O(2)Al2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Al(1) and two equivalent Sn(1) atoms to form OAl2Sn2 tetrahedra that share corners with two equivalent O(1)Al4 tetrahedra, corners with twelve equivalent O(2)Al2Sn2 tetrahedra,  an edgeedge with one O(1)Al4 tetrahedra, and edges with four equivalent O(2)Al2Sn2 tetrahedra.