MgV(GeO3)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MgO6 octahedra that share corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, edges with three equivalent V(1)O6 octahedra, and  an edgeedge with one Ge(2)O4 tetrahedra. V(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form VO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with three equivalent Ge(2)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. 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 V(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. In the second Ge site, Ge(2) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with two equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-60°. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent V(1), and one Ge(1) atom. In the second O site, O(6) is bonded to one Mg(1), two equivalent V(1), and one Ge(2) atom to form distorted corner-sharing OMgV2Ge trigonal pyramids. In the third O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Ge(2) atoms. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ge(1) atoms. In the fifth O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one Ge(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(1), and one Ge(1) atom.
MgV(GeO3)2 crystallizes in the monoclinic P2_1/c space group. Mg(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form MgO6 octahedra that share corners with two equivalent Ge(2)O4 tetrahedra, corners with four equivalent Ge(1)O4 tetrahedra, edges with three equivalent V(1)O6 octahedra, and  an edgeedge with one Ge(2)O4 tetrahedra. The Mg(1)-O(1) bond length is 2.28 Å. The Mg(1)-O(2) bond length is 2.30 Å. The Mg(1)-O(3) bond length is 2.08 Å. The Mg(1)-O(4) bond length is 2.03 Å. The Mg(1)-O(5) bond length is 2.10 Å. The Mg(1)-O(6) bond length is 2.14 Å. V(1) is bonded to one O(3), one O(4), two equivalent O(5), and two equivalent O(6) atoms to form VO6 octahedra that share corners with three equivalent Ge(1)O4 tetrahedra, corners with three equivalent Ge(2)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with three equivalent Mg(1)O6 octahedra. The V(1)-O(3) bond length is 2.11 Å. The V(1)-O(4) bond length is 2.16 Å. There is one shorter (2.20 Å) and one longer (2.22 Å) V(1)-O(5) bond length. There is one shorter (2.15 Å) and one longer (2.22 Å) V(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 V(1)O6 octahedra, corners with four equivalent Mg(1)O6 octahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 51-66°. The Ge(1)-O(4) bond length is 1.73 Å. The Ge(1)-O(5) bond length is 1.77 Å. Both Ge(1)-O(2) bond lengths are 1.84 Å. In the second Ge site, Ge(2) is bonded to one O(3), one O(6), and two equivalent O(1) atoms to form GeO4 tetrahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with two equivalent Ge(2)O4 tetrahedra, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-60°. The Ge(2)-O(3) bond length is 1.73 Å. The Ge(2)-O(6) bond length is 1.76 Å. There is one shorter (1.80 Å) and one longer (1.82 Å) Ge(2)-O(1) bond length. There are six inequivalent O sites. In the first O site, O(5) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), two equivalent V(1), and one Ge(1) atom. In the second O site, O(6) is bonded to one Mg(1), two equivalent V(1), and one Ge(2) atom to form distorted corner-sharing OMgV2Ge trigonal pyramids. In the third O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent Ge(2) atoms. In the fourth O site, O(2) is bonded in a trigonal planar geometry to one Mg(1) and two equivalent Ge(1) atoms. In the fifth O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one Ge(2) atom. In the sixth O site, O(4) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(1), and one Ge(1) atom.