Mn(GeO3)2 crystallizes in the monoclinic P2_1/c space group. Mn(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O5 trigonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, and  an edgeedge with one Ge(2)O5 trigonal bipyramid. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-60°. In the second Ge site, Ge(2) is bonded to one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted GeO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Ge(2)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Ge(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-46°. There are six inequivalent O sites. In the first O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Mn(1) and one Ge(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(2) atoms. In the third O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Ge(2) atoms. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one Ge(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Ge(1) atom.
Mn(GeO3)2 crystallizes in the monoclinic P2_1/c space group. Mn(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form MnO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with two equivalent Ge(2)O5 trigonal bipyramids, edges with two equivalent Mn(1)O6 octahedra, and  an edgeedge with one Ge(2)O5 trigonal bipyramid. The Mn(1)-O(3) bond length is 1.96 Å. The Mn(1)-O(4) bond length is 1.86 Å. There is one shorter (2.00 Å) and one longer (2.05 Å) Mn(1)-O(5) bond length. There is one shorter (1.95 Å) and one longer (1.99 Å) Mn(1)-O(6) bond length. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(4), one O(5), and two equivalent O(2) atoms to form GeO4 tetrahedra that share corners with three equivalent Mn(1)O6 octahedra and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 43-60°. The Ge(1)-O(4) bond length is 1.75 Å. The Ge(1)-O(5) bond length is 1.83 Å. Both Ge(1)-O(2) bond lengths are 1.75 Å. In the second Ge site, Ge(2) is bonded to one O(6), two equivalent O(1), and two equivalent O(3) atoms to form distorted GeO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Ge(2)O5 trigonal bipyramids,  an edgeedge with one Mn(1)O6 octahedra, and  an edgeedge with one Ge(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 37-46°. The Ge(2)-O(6) bond length is 1.86 Å. There is one shorter (1.75 Å) and one longer (1.78 Å) Ge(2)-O(1) bond length. There is one shorter (1.82 Å) and one longer (2.18 Å) Ge(2)-O(3) bond length. There are six inequivalent O sites. In the first O site, O(6) is bonded in a trigonal non-coplanar geometry to two equivalent Mn(1) and one Ge(2) atom. In the second O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Ge(2) atoms. In the third O site, O(2) is bonded in a bent 120 degrees geometry to two equivalent Ge(1) atoms. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one Mn(1) and two equivalent Ge(2) atoms. In the fifth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one Ge(1) atom. In the sixth O site, O(5) is bonded in a trigonal planar geometry to two equivalent Mn(1) and one Ge(1) atom.