NiZn(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Ni(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with three equivalent Zn(1)O6 octahedra. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ZnO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ni(1)O6 octahedra. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Ni(1)O6 octahedra, corners with four equivalent Zn(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-64°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ni(1), one Zn(1), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Ni(1), one Zn(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OZnNi2Ge trigonal pyramids.
NiZn(GeO3)2 is Esseneite structured and crystallizes in the monoclinic C2/c space group. Ni(1) is bonded to two equivalent O(2) and four equivalent O(3) atoms to form NiO6 octahedra that share corners with six equivalent Ge(1)O4 tetrahedra, edges with two equivalent Ni(1)O6 octahedra, and edges with three equivalent Zn(1)O6 octahedra. Both Ni(1)-O(2) bond lengths are 2.09 Å. There are two shorter (2.07 Å) and two longer (2.16 Å) Ni(1)-O(3) bond lengths. Zn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form ZnO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra and edges with three equivalent Ni(1)O6 octahedra. Both Zn(1)-O(1) bond lengths are 2.40 Å. Both Zn(1)-O(2) bond lengths are 2.00 Å. Both Zn(1)-O(3) bond lengths are 2.14 Å. Ge(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with three equivalent Ni(1)O6 octahedra, corners with four equivalent Zn(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-64°. The Ge(1)-O(2) bond length is 1.74 Å. The Ge(1)-O(3) bond length is 1.77 Å. Both Ge(1)-O(1) bond lengths are 1.81 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Ge(1) atoms. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ni(1), one Zn(1), and one Ge(1) atom. In the third O site, O(3) is bonded to two equivalent Ni(1), one Zn(1), and one Ge(1) atom to form a mixture of distorted corner and edge-sharing OZnNi2Ge trigonal pyramids.