MgWTe3O12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(11), one O(12), one O(3), one O(4), and one O(7) atom to form distorted MgO6 octahedra that share  a cornercorner with one Te(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra,  an edgeedge with one Te(2)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, and  a faceface with one Te(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. W(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with four equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-63°. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form TeO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with four equivalent Te(3)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-44°. In the second Te site, Te(2) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form TeO6 octahedra that share corners with two equivalent Te(3)O6 octahedra, corners with four equivalent W(1)O6 octahedra, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-40°. In the third Te site, Te(3) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form TeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Te(2)O6 octahedra, corners with four equivalent Te(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-59°. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(1), and one Te(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(1), and one Te(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Te(2) and one Te(3) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(2), and one Te(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Te(1) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(1), and one Te(3) atom.
MgWTe3O12 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(11), one O(12), one O(3), one O(4), and one O(7) atom to form distorted MgO6 octahedra that share  a cornercorner with one Te(3)O6 octahedra, corners with two equivalent W(1)O6 octahedra,  an edgeedge with one Te(2)O6 octahedra, edges with two equivalent Te(1)O6 octahedra, and  a faceface with one Te(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 59-63°. The Mg(1)-O(1) bond length is 2.05 Å. The Mg(1)-O(11) bond length is 2.08 Å. The Mg(1)-O(12) bond length is 2.15 Å. The Mg(1)-O(3) bond length is 2.09 Å. The Mg(1)-O(4) bond length is 2.16 Å. The Mg(1)-O(7) bond length is 2.10 Å. W(1) is bonded to one O(10), one O(11), one O(2), one O(3), one O(5), and one O(8) atom to form WO6 octahedra that share corners with two equivalent Mg(1)O6 octahedra, corners with two equivalent Te(1)O6 octahedra, and corners with four equivalent Te(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-63°. The W(1)-O(10) bond length is 1.93 Å. The W(1)-O(11) bond length is 2.05 Å. The W(1)-O(2) bond length is 1.91 Å. The W(1)-O(3) bond length is 2.01 Å. The W(1)-O(5) bond length is 1.93 Å. The W(1)-O(8) bond length is 1.95 Å. There are three inequivalent Te sites. In the first Te site, Te(1) is bonded to one O(1), one O(11), one O(12), one O(2), one O(4), and one O(9) atom to form TeO6 octahedra that share corners with two equivalent W(1)O6 octahedra, corners with four equivalent Te(3)O6 octahedra, and edges with two equivalent Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-44°. The Te(1)-O(1) bond length is 1.97 Å. The Te(1)-O(11) bond length is 2.08 Å. The Te(1)-O(12) bond length is 1.91 Å. The Te(1)-O(2) bond length is 2.00 Å. The Te(1)-O(4) bond length is 1.90 Å. The Te(1)-O(9) bond length is 1.93 Å. In the second Te site, Te(2) is bonded to one O(10), one O(3), one O(5), one O(6), one O(7), and one O(8) atom to form TeO6 octahedra that share corners with two equivalent Te(3)O6 octahedra, corners with four equivalent W(1)O6 octahedra, and  an edgeedge with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 27-40°. The Te(2)-O(10) bond length is 1.96 Å. The Te(2)-O(3) bond length is 2.06 Å. The Te(2)-O(5) bond length is 2.02 Å. The Te(2)-O(6) bond length is 1.90 Å. The Te(2)-O(7) bond length is 1.89 Å. The Te(2)-O(8) bond length is 1.97 Å. In the third Te site, Te(3) is bonded to one O(1), one O(12), one O(4), one O(6), one O(7), and one O(9) atom to form TeO6 octahedra that share  a cornercorner with one Mg(1)O6 octahedra, corners with two equivalent Te(2)O6 octahedra, corners with four equivalent Te(1)O6 octahedra, and  a faceface with one Mg(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-59°. The Te(3)-O(1) bond length is 2.08 Å. The Te(3)-O(12) bond length is 2.19 Å. The Te(3)-O(4) bond length is 2.29 Å. The Te(3)-O(6) bond length is 2.01 Å. The Te(3)-O(7) bond length is 2.26 Å. The Te(3)-O(9) bond length is 2.03 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one Te(1), and one Te(3) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Te(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Te(2) atom. In the fourth O site, O(4) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(1), and one Te(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Te(2) and one Te(3) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(2), and one Te(3) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Te(1) and one Te(3) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one W(1) and one Te(2) atom. In the eleventh O site, O(11) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Te(1) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Mg(1), one Te(1), and one Te(3) atom.