K2ZrGe2O7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. Zr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form ZrO6 octahedra that share corners with six 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 three equivalent Zr(1)O6 octahedra and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-51°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Zr(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Zr(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Ge(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to three equivalent K(1), one Zr(1), and one Ge(1) atom.
K2ZrGe2O7 crystallizes in the monoclinic C2/c space group. K(1) is bonded in a 9-coordinate geometry to one O(3), two equivalent O(1), three equivalent O(2), and three equivalent O(4) atoms. The K(1)-O(3) bond length is 2.79 Å. There is one shorter (3.03 Å) and one longer (3.29 Å) K(1)-O(1) bond length. There are a spread of K(1)-O(2) bond distances ranging from 2.95-2.98 Å. There are a spread of K(1)-O(4) bond distances ranging from 2.72-3.26 Å. Zr(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form ZrO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra. Both Zr(1)-O(1) bond lengths are 2.10 Å. Both Zr(1)-O(2) bond lengths are 2.16 Å. Both Zr(1)-O(4) bond lengths are 2.12 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 three equivalent Zr(1)O6 octahedra and  a cornercorner with one Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 19-51°. The Ge(1)-O(1) bond length is 1.75 Å. The Ge(1)-O(2) bond length is 1.76 Å. The Ge(1)-O(3) bond length is 1.81 Å. The Ge(1)-O(4) bond length is 1.77 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Zr(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent K(1), one Zr(1), and one Ge(1) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent K(1) and two equivalent Ge(1) atoms. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to three equivalent K(1), one Zr(1), and one Ge(1) atom.