Be2GeO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Ge(1)O4 tetrahedra. In the second Be site, Be(2) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Be(2)O4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Ge(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Ge(1) atom.
Be2GeO4 crystallizes in the trigonal R-3 space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(2), one O(4), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Ge(1)O4 tetrahedra. The Be(1)-O(2) bond length is 1.64 Å. The Be(1)-O(4) bond length is 1.64 Å. There is one shorter (1.63 Å) and one longer (1.64 Å) Be(1)-O(1) bond length. In the second Be site, Be(2) is bonded to one O(2), one O(4), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with two equivalent Be(2)O4 tetrahedra, and corners with four equivalent Ge(1)O4 tetrahedra. The Be(2)-O(2) bond length is 1.63 Å. The Be(2)-O(4) bond length is 1.63 Å. Both Be(2)-O(3) bond lengths are 1.66 Å. Ge(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GeO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra and corners with four equivalent Be(2)O4 tetrahedra. The Ge(1)-O(1) bond length is 1.75 Å. The Ge(1)-O(2) bond length is 1.75 Å. The Ge(1)-O(3) bond length is 1.77 Å. The Ge(1)-O(4) bond length is 1.76 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Ge(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Be(1), one Be(2), and one Ge(1) atom.