MgV4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share  a cornercorner with one V(2)O6 octahedra, corners with three equivalent V(4)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, edges with two equivalent V(3)O6 octahedra, and  a faceface with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-69°. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form distorted VO6 octahedra that share corners with three equivalent V(2)O6 octahedra, corners with four equivalent V(4)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-53°. In the second V site, V(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form VO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with four equivalent V(3)O6 octahedra,  an edgeedge with one V(4)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-56°. In the third V site, V(3) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), and one O(7) atom to form VO6 octahedra that share corners with three equivalent V(4)O6 octahedra, corners with four equivalent V(2)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-61°. In the fourth V site, V(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form distorted VO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with four equivalent V(1)O6 octahedra, and  an edgeedge with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-69°. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one V(1), one V(2), and one V(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one V(4) atom. In the third O site, O(3) is bonded in a distorted 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 distorted trigonal pyramidal geometry to one Mg(1), one V(2), one V(3), and one V(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(3), and one V(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one V(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one V(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mg(1), one V(1), and one V(4) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one V(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one V(3) atom.
MgV4O10 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(10), one O(4), one O(5), one O(6), one O(7), and one O(8) atom to form distorted MgO6 octahedra that share  a cornercorner with one V(2)O6 octahedra, corners with three equivalent V(4)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, edges with two equivalent V(3)O6 octahedra, and  a faceface with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 48-69°. The Mg(1)-O(10) bond length is 2.09 Å. The Mg(1)-O(4) bond length is 2.22 Å. The Mg(1)-O(5) bond length is 1.97 Å. The Mg(1)-O(6) bond length is 2.14 Å. The Mg(1)-O(7) bond length is 1.99 Å. The Mg(1)-O(8) bond length is 2.02 Å. There are four inequivalent V sites. In the first V site, V(1) is bonded to one O(1), one O(2), one O(3), one O(6), one O(8), and one O(9) atom to form distorted VO6 octahedra that share corners with three equivalent V(2)O6 octahedra, corners with four equivalent V(4)O6 octahedra,  an edgeedge with one Mg(1)O6 octahedra, and  an edgeedge with one V(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-53°. The V(1)-O(1) bond length is 1.98 Å. The V(1)-O(2) bond length is 1.80 Å. The V(1)-O(3) bond length is 2.01 Å. The V(1)-O(6) bond length is 1.78 Å. The V(1)-O(8) bond length is 1.82 Å. The V(1)-O(9) bond length is 2.17 Å. In the second V site, V(2) is bonded to one O(1), one O(10), one O(2), one O(4), one O(6), and one O(7) atom to form VO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with three equivalent V(1)O6 octahedra, corners with four equivalent V(3)O6 octahedra,  an edgeedge with one V(4)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-56°. The V(2)-O(1) bond length is 2.02 Å. The V(2)-O(10) bond length is 2.01 Å. The V(2)-O(2) bond length is 2.00 Å. The V(2)-O(4) bond length is 2.06 Å. The V(2)-O(6) bond length is 2.02 Å. The V(2)-O(7) bond length is 1.75 Å. In the third V site, V(3) is bonded to one O(1), one O(10), one O(3), one O(4), one O(5), and one O(7) atom to form VO6 octahedra that share corners with three equivalent V(4)O6 octahedra, corners with four equivalent V(2)O6 octahedra,  an edgeedge with one V(1)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-61°. The V(3)-O(1) bond length is 1.96 Å. The V(3)-O(10) bond length is 1.76 Å. The V(3)-O(3) bond length is 2.04 Å. The V(3)-O(4) bond length is 2.01 Å. The V(3)-O(5) bond length is 2.00 Å. The V(3)-O(7) bond length is 2.08 Å. In the fourth V site, V(4) is bonded to one O(2), one O(3), one O(4), one O(5), one O(8), and one O(9) atom to form distorted VO6 octahedra that share corners with three equivalent Mg(1)O6 octahedra, corners with three equivalent V(3)O6 octahedra, corners with four equivalent V(1)O6 octahedra, and  an edgeedge with one V(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 25-69°. The V(4)-O(2) bond length is 2.26 Å. The V(4)-O(3) bond length is 1.89 Å. The V(4)-O(4) bond length is 2.12 Å. The V(4)-O(5) bond length is 1.83 Å. The V(4)-O(8) bond length is 1.97 Å. The V(4)-O(9) bond length is 1.66 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one V(1), one V(2), and one V(3) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one V(1), one V(2), and one V(4) atom. In the third O site, O(3) is bonded in a distorted 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 distorted trigonal pyramidal geometry to one Mg(1), one V(2), one V(3), and one V(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one V(3), and one V(4) atom. In the sixth O site, O(6) is bonded in a T-shaped geometry to one Mg(1), one V(1), and one V(2) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Mg(1), one V(2), and one V(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Mg(1), one V(1), and one V(4) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one V(1) and one V(4) atom. In the tenth O site, O(10) is bonded in a T-shaped geometry to one Mg(1), one V(2), and one V(3) atom.