LiFeGe2O6 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Li(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Fe(1)O6 octahedra. Fe(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with three equivalent Li(1)O6 octahedra. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with four equivalent Li(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-65°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Fe(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1) and two equivalent Ge(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Ge(1) atom.
LiFeGe2O6 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Li(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form LiO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Fe(1)O6 octahedra. Both Li(1)-O(1) bond lengths are 2.19 Å. Both Li(1)-O(2) bond lengths are 2.30 Å. Both Li(1)-O(3) bond lengths are 2.13 Å. Fe(1) is bonded to two equivalent O(3) and four equivalent O(1) atoms to form FeO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Fe(1)O6 octahedra, and edges with three equivalent Li(1)O6 octahedra. Both Fe(1)-O(3) bond lengths are 1.97 Å. There are two shorter (2.05 Å) and two longer (2.14 Å) Fe(1)-O(1) bond lengths. Ge(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Fe(1)O6 octahedra, corners with four equivalent Li(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 50-65°. The Ge(1)-O(1) bond length is 1.79 Å. The Ge(1)-O(3) bond length is 1.74 Å. Both Ge(1)-O(2) bond lengths are 1.80 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Li(1), two equivalent Fe(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Li(1) and two equivalent Ge(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Li(1), one Fe(1), and one Ge(1) atom.