Lu2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Lu(1) is bonded to two equivalent O(2), two equivalent O(4), and three equivalent O(3) atoms to form distorted LuO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Lu(1)O7 pentagonal bipyramids, and  an edgeedge with one 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 five equivalent Lu(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Lu(1)O7 pentagonal bipyramid. There are four inequivalent O sites. In the first O site, O(4) is bonded in a trigonal planar geometry to two equivalent Lu(1) and one Ge(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ge(1) atoms. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one Ge(1) atom. In the fourth O site, O(3) is bonded to three equivalent Lu(1) and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OLu3Ge trigonal pyramids.
Lu2Ge2O7 crystallizes in the tetragonal P4_12_12 space group. Lu(1) is bonded to two equivalent O(2), two equivalent O(4), and three equivalent O(3) atoms to form distorted LuO7 pentagonal bipyramids that share corners with five equivalent Ge(1)O4 tetrahedra, edges with five equivalent Lu(1)O7 pentagonal bipyramids, and  an edgeedge with one Ge(1)O4 tetrahedra. There is one shorter (2.16 Å) and one longer (2.31 Å) Lu(1)-O(2) bond length. There is one shorter (2.19 Å) and one longer (2.20 Å) Lu(1)-O(4) bond length. There are a spread of Lu(1)-O(3) bond distances ranging from 2.23-2.49 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 five equivalent Lu(1)O7 pentagonal bipyramids,  a cornercorner with one Ge(1)O4 tetrahedra, and  an edgeedge with one Lu(1)O7 pentagonal bipyramid. The Ge(1)-O(1) bond length is 1.77 Å. The Ge(1)-O(2) bond length is 1.74 Å. The Ge(1)-O(3) bond length is 1.78 Å. The Ge(1)-O(4) bond length is 1.74 Å. There are four inequivalent O sites. In the first O site, O(4) is bonded in a trigonal planar geometry to two equivalent Lu(1) and one Ge(1) atom. In the second O site, O(1) is bonded in a distorted bent 150 degrees geometry to two equivalent Ge(1) atoms. In the third O site, O(2) is bonded in a 3-coordinate geometry to two equivalent Lu(1) and one Ge(1) atom. In the fourth O site, O(3) is bonded to three equivalent Lu(1) and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OLu3Ge trigonal pyramids.