MgV(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. V(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form VO6 octahedra that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-25°. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 25°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one W(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one W(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one V(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one V(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one V(1) and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mg(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one V(1), one W(1), and one W(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one V(1), one W(1), and one W(2) atom.
MgV(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent V(1)O6 octahedra, corners with two equivalent W(2)O6 octahedra, and corners with three equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-64°. The Mg(1)-O(1) bond length is 1.97 Å. The Mg(1)-O(2) bond length is 2.08 Å. The Mg(1)-O(4) bond length is 2.03 Å. The Mg(1)-O(6) bond length is 1.96 Å. V(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form VO6 octahedra that share  a cornercorner with one W(1)O6 octahedra,  a cornercorner with one W(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 23-25°. The V(1)-O(2) bond length is 2.17 Å. The V(1)-O(3) bond length is 2.01 Å. The V(1)-O(4) bond length is 2.17 Å. The V(1)-O(5) bond length is 1.90 Å. The V(1)-O(7) bond length is 2.09 Å. The V(1)-O(8) bond length is 2.16 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 23°. The W(1)-O(1) bond length is 1.79 Å. The W(1)-O(2) bond length is 1.88 Å. The W(1)-O(3) bond length is 2.11 Å. The W(1)-O(4) bond length is 2.26 Å. The W(1)-O(7) bond length is 1.96 Å. The W(1)-O(8) bond length is 1.93 Å. In the second W site, W(2) is bonded to one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted WO6 octahedra that share  a cornercorner with one V(1)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, edges with two equivalent V(1)O6 octahedra, and edges with two equivalent W(1)O6 octahedra. The corner-sharing octahedral tilt angles are 25°. The W(2)-O(3) bond length is 2.02 Å. The W(2)-O(4) bond length is 2.12 Å. The W(2)-O(5) bond length is 1.95 Å. The W(2)-O(6) bond length is 1.81 Å. The W(2)-O(7) bond length is 2.12 Å. The W(2)-O(8) bond length is 2.18 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mg(1) and one W(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one V(1), and one W(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one V(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one V(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a water-like geometry to one V(1) and one W(2) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mg(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one V(1), one W(1), and one W(2) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one V(1), one W(1), and one W(2) atom.