Ge7O16 crystallizes in the cubic P-43m space group. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. In the second Ge site, Ge(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form GeO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ge(2)O6 octahedra. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ge(2) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(2) atom.
Ge7O16 crystallizes in the cubic P-43m space group. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to four equivalent O(1) atoms to form corner-sharing GeO4 tetrahedra. The corner-sharing octahedral tilt angles are 54°. All Ge(1)-O(1) bond lengths are 1.78 Å. In the second Ge site, Ge(2) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form GeO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ge(2)O6 octahedra. All Ge(2)-O(1) bond lengths are 1.85 Å. All Ge(2)-O(2) bond lengths are 1.99 Å. There are two inequivalent O sites. In the first O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Ge(2) atoms. In the second O site, O(1) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(2) atom.