BaSn(GeO3)3 crystallizes in the hexagonal P-6c2 space group. Ba(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. Sn(1) is bonded to six equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one Sn(1), and one Ge(1) atom.
BaSn(GeO3)3 crystallizes in the hexagonal P-6c2 space group. Ba(1) is bonded in a 6-coordinate geometry to six equivalent O(2) atoms. All Ba(1)-O(2) bond lengths are 2.83 Å. Sn(1) is bonded to six equivalent O(2) atoms to form SnO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. All Sn(1)-O(2) bond lengths are 2.08 Å. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 49°. There is one shorter (1.78 Å) and one longer (1.80 Å) Ge(1)-O(1) bond length. Both Ge(1)-O(2) bond lengths are 1.75 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(1), one Sn(1), and one Ge(1) atom.