MgV(TeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. V(1) is bonded to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom to form distorted VO6 octahedra that share  a cornercorner with one Te(1)O5 trigonal bipyramid. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(5) atom to form distorted TeO5 trigonal bipyramids that share  a cornercorner with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the second Te site, Te(2) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(2), one O(4), and one O(9) atom. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one O(3), one O(5), one O(6), and one O(8) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one V(1) and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(1), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(4) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Mg(1), one Te(2), and one Te(4) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one V(1) and one Te(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one Te(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Te(2), and one Te(3) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Mg(1) and one Te(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one V(1), one Te(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom.
MgV(TeO3)4 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 6-coordinate geometry to one O(10), one O(2), one O(5), one O(6), one O(8), and one O(9) atom. The Mg(1)-O(10) bond length is 2.05 Å. The Mg(1)-O(2) bond length is 2.67 Å. The Mg(1)-O(5) bond length is 2.08 Å. The Mg(1)-O(6) bond length is 2.01 Å. The Mg(1)-O(8) bond length is 2.37 Å. The Mg(1)-O(9) bond length is 2.05 Å. V(1) is bonded to one O(1), one O(11), one O(4), one O(7), one O(8), and one O(9) atom to form distorted VO6 octahedra that share  a cornercorner with one Te(1)O5 trigonal bipyramid. The V(1)-O(1) bond length is 1.79 Å. The V(1)-O(11) bond length is 2.01 Å. The V(1)-O(4) bond length is 2.01 Å. The V(1)-O(7) bond length is 1.96 Å. The V(1)-O(8) bond length is 1.95 Å. The V(1)-O(9) bond length is 2.30 Å. There are four inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(10), one O(11), one O(2), one O(3), and one O(5) atom to form distorted TeO5 trigonal bipyramids that share  a cornercorner with one V(1)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Te(1)-O(10) bond length is 1.90 Å. The Te(1)-O(11) bond length is 1.94 Å. The Te(1)-O(2) bond length is 2.01 Å. The Te(1)-O(3) bond length is 1.99 Å. The Te(1)-O(5) bond length is 1.87 Å. In the second Te site, Te(2) is bonded in a 6-coordinate geometry to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom. The Te(2)-O(1) bond length is 2.13 Å. The Te(2)-O(12) bond length is 2.19 Å. The Te(2)-O(4) bond length is 2.47 Å. The Te(2)-O(6) bond length is 2.64 Å. The Te(2)-O(7) bond length is 1.93 Å. The Te(2)-O(9) bond length is 1.98 Å. In the third Te site, Te(3) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(2), one O(4), and one O(9) atom. The Te(3)-O(11) bond length is 2.67 Å. The Te(3)-O(12) bond length is 1.88 Å. The Te(3)-O(2) bond length is 2.03 Å. The Te(3)-O(4) bond length is 1.93 Å. The Te(3)-O(9) bond length is 2.63 Å. In the fourth Te site, Te(4) is bonded in a 3-coordinate geometry to one O(3), one O(5), one O(6), and one O(8) atom. The Te(4)-O(3) bond length is 1.98 Å. The Te(4)-O(5) bond length is 2.56 Å. The Te(4)-O(6) bond length is 1.88 Å. The Te(4)-O(8) bond length is 1.98 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one V(1) and one Te(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Te(1) and one Te(4) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one V(1), one Te(2), and one Te(3) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mg(1), one Te(1), and one Te(4) atom. In the sixth O site, O(6) is bonded in a distorted water-like geometry to one Mg(1), one Te(2), and one Te(4) atom. In the seventh O site, O(7) is bonded in a distorted water-like geometry to one V(1) and one Te(2) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mg(1), one V(1), and one Te(4) atom. In the ninth O site, O(9) is bonded in a 4-coordinate geometry to one Mg(1), one V(1), one Te(2), and one Te(3) atom. In the tenth O site, O(10) is bonded in a water-like geometry to one Mg(1) and one Te(1) atom. In the eleventh O site, O(11) is bonded in a distorted bent 120 degrees geometry to one V(1), one Te(1), and one Te(3) atom. In the twelfth O site, O(12) is bonded in a distorted bent 120 degrees geometry to one Te(2) and one Te(3) atom.