MgV4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form MgO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra,  a cornercorner with one V(2)O4 tetrahedra,  a cornercorner with one V(3)O5 trigonal bipyramid, and corners with two equivalent V(4)O5 trigonal bipyramids. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(3)O5 trigonal bipyramids, and corners with two equivalent V(4)O5 trigonal bipyramids. In the second V site, V(2) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(3)O5 trigonal bipyramids, and corners with two equivalent V(4)O5 trigonal bipyramids. In the third V site, V(3) is bonded to one O(1), one O(10), one O(3), one O(4), and one O(7) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, and  an edgeedge with one V(4)O5 trigonal bipyramid. In the fourth V site, V(4) is bonded to one O(2), one O(3), one O(4), one O(8), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, and  an edgeedge with one V(3)O5 trigonal bipyramid. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one V(1) and one V(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one V(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one V(1), one V(3), and one V(4) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one V(2), one V(3), and one V(4) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mg(1) and one V(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one V(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Mg(1) and one V(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Mg(1) and one V(4) atom. In the ninth O site, O(9) is bonded in a linear geometry to one V(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one V(2) and one V(3) atom.
MgV4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(5), one O(7), and one O(8) atom to form MgO4 tetrahedra that share  a cornercorner with one V(1)O4 tetrahedra,  a cornercorner with one V(2)O4 tetrahedra,  a cornercorner with one V(3)O5 trigonal bipyramid, and corners with two equivalent V(4)O5 trigonal bipyramids. The Mg(1)-O(2) bond length is 2.03 Å. The Mg(1)-O(5) bond length is 1.98 Å. The Mg(1)-O(7) bond length is 1.93 Å. The Mg(1)-O(8) bond length is 1.99 Å. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(3), one O(5), and one O(9) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(3)O5 trigonal bipyramids, and corners with two equivalent V(4)O5 trigonal bipyramids. The V(1)-O(1) bond length is 1.73 Å. The V(1)-O(3) bond length is 1.85 Å. The V(1)-O(5) bond length is 1.69 Å. The V(1)-O(9) bond length is 1.73 Å. In the second V site, V(2) is bonded to one O(10), one O(2), one O(4), and one O(6) atom to form VO4 tetrahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(3)O5 trigonal bipyramids, and corners with two equivalent V(4)O5 trigonal bipyramids. The V(2)-O(10) bond length is 1.73 Å. The V(2)-O(2) bond length is 1.83 Å. The V(2)-O(4) bond length is 1.87 Å. The V(2)-O(6) bond length is 1.63 Å. In the third V site, V(3) is bonded to one O(1), one O(10), one O(3), one O(4), and one O(7) atom to form distorted VO5 trigonal bipyramids that share  a cornercorner with one Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, and  an edgeedge with one V(4)O5 trigonal bipyramid. The V(3)-O(1) bond length is 1.91 Å. The V(3)-O(10) bond length is 1.93 Å. The V(3)-O(3) bond length is 1.99 Å. The V(3)-O(4) bond length is 2.03 Å. The V(3)-O(7) bond length is 1.67 Å. In the fourth V site, V(4) is bonded to one O(2), one O(3), one O(4), one O(8), and one O(9) atom to form distorted VO5 trigonal bipyramids that share corners with two equivalent Mg(1)O4 tetrahedra, corners with two equivalent V(1)O4 tetrahedra, corners with two equivalent V(2)O4 tetrahedra, and  an edgeedge with one V(3)O5 trigonal bipyramid. The V(4)-O(2) bond length is 2.01 Å. The V(4)-O(3) bond length is 2.01 Å. The V(4)-O(4) bond length is 1.99 Å. The V(4)-O(8) bond length is 1.68 Å. The V(4)-O(9) bond length is 1.91 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one V(1) and one V(3) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to one Mg(1), one V(2), and one V(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one V(1), one V(3), and one V(4) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one V(2), one V(3), and one V(4) atom. In the fifth O site, O(5) is bonded in a bent 120 degrees geometry to one Mg(1) and one V(1) atom. In the sixth O site, O(6) is bonded in a single-bond geometry to one V(2) atom. In the seventh O site, O(7) is bonded in a linear geometry to one Mg(1) and one V(3) atom. In the eighth O site, O(8) is bonded in a bent 120 degrees geometry to one Mg(1) and one V(4) atom. In the ninth O site, O(9) is bonded in a linear geometry to one V(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one V(2) and one V(3) atom.