CeMn2(GeO3)4 crystallizes in the tetragonal P4/nbm space group. Ce(1) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-69°. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ce(1), one Mn(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mn(1) and two equivalent Ge(1) atoms.
CeMn2(GeO3)4 crystallizes in the tetragonal P4/nbm space group. Ce(1) is bonded in a 8-coordinate geometry to eight equivalent O(1) atoms. All Ce(1)-O(1) bond lengths are 2.37 Å. Mn(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form MnO6 octahedra that share corners with eight equivalent Ge(1)O4 tetrahedra. Both Mn(1)-O(2) bond lengths are 2.45 Å. All Mn(1)-O(1) bond lengths are 2.15 Å. Ge(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-69°. Both Ge(1)-O(1) bond lengths are 1.76 Å. Both Ge(1)-O(2) bond lengths are 1.82 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Ce(1), one Mn(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a trigonal non-coplanar geometry to one Mn(1) and two equivalent Ge(1) atoms.