Al2GeO6 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. Ge(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with eight equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms.
Al2GeO6 crystallizes in the orthorhombic Pnma space group. Al(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Al(1)O6 octahedra, corners with four equivalent Ge(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles are 28°. The Al(1)-O(1) bond length is 1.91 Å. The Al(1)-O(2) bond length is 1.96 Å. There is one shorter (1.90 Å) and one longer (1.93 Å) Al(1)-O(3) bond length. There is one shorter (1.84 Å) and one longer (1.85 Å) Al(1)-O(4) bond length. Ge(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form GeO4 tetrahedra that share corners with eight equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 52-54°. The Ge(1)-O(1) bond length is 1.78 Å. The Ge(1)-O(2) bond length is 1.79 Å. Both Ge(1)-O(3) bond lengths are 1.78 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Al(1) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Al(1) atoms.