Ho2Sn2O7 crystallizes in the cubic Fd-3m space group. Ho(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 corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 53°. There are two inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Ho(1) atoms to form OHo4 tetrahedra that share corners with four equivalent O(1)Ho4 tetrahedra, corners with twelve equivalent O(2)Ho2Sn2 tetrahedra, and edges with six equivalent O(2)Ho2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(1) and two equivalent Sn(1) atoms to form distorted OHo2Sn2 tetrahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with twelve equivalent O(2)Ho2Sn2 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, and edges with four equivalent O(2)Ho2Sn2 tetrahedra.
Ho2Sn2O7 crystallizes in the cubic Fd-3m space group. Ho(1) is bonded in a body-centered cubic geometry to two equivalent O(1) and six equivalent O(2) atoms. Both Ho(1)-O(1) bond lengths are 2.24 Å. All Ho(1)-O(2) bond lengths are 2.48 Å. Sn(1) is bonded to six equivalent O(2) atoms to form corner-sharing SnO6 octahedra. The corner-sharing octahedral tilt angles are 53°. 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 Ho(1) atoms to form OHo4 tetrahedra that share corners with four equivalent O(1)Ho4 tetrahedra, corners with twelve equivalent O(2)Ho2Sn2 tetrahedra, and edges with six equivalent O(2)Ho2Sn2 tetrahedra. In the second O site, O(2) is bonded to two equivalent Ho(1) and two equivalent Sn(1) atoms to form distorted OHo2Sn2 tetrahedra that share corners with two equivalent O(1)Ho4 tetrahedra, corners with twelve equivalent O(2)Ho2Sn2 tetrahedra,  an edgeedge with one O(1)Ho4 tetrahedra, and edges with four equivalent O(2)Ho2Sn2 tetrahedra.