MgCuAl(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. 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 WO6 octahedra that share corners with three equivalent Al(1)O5 square pyramids and edges with two equivalent W(2)O6 octahedra. 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 WO6 octahedra that share corners with three equivalent Al(1)O5 square pyramids and edges with two equivalent W(1)O6 octahedra. Cu(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(6), and one O(7) atom. Al(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form distorted AlO5 square pyramids that share corners with three equivalent W(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-53°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one W(1), one Cu(1), and one Al(1) atom. In the second O site, O(2) is bonded to one Mg(1), one W(1), one Cu(1), and one Al(1) atom to form corner-sharing OMgAlCuW tetrahedra. In the third O site, O(3) is bonded to one Mg(1), one W(1), one W(2), and one Cu(1) atom to form distorted corner-sharing OMgCuW2 trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Mg(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(2), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one W(2), one Cu(1), and one Al(1) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one W(1), one W(2), and one Cu(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Al(1) atom.
MgCuAl(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom. The Mg(1)-O(1) bond length is 2.07 Å. The Mg(1)-O(2) bond length is 2.10 Å. The Mg(1)-O(3) bond length is 2.00 Å. The Mg(1)-O(4) bond length is 2.21 Å. The Mg(1)-O(5) bond length is 2.00 Å. The Mg(1)-O(6) bond length is 2.71 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 WO6 octahedra that share corners with three equivalent Al(1)O5 square pyramids and edges with two equivalent W(2)O6 octahedra. The W(1)-O(1) bond length is 1.97 Å. The W(1)-O(2) bond length is 2.04 Å. The W(1)-O(3) bond length is 2.12 Å. The W(1)-O(4) bond length is 1.97 Å. The W(1)-O(7) bond length is 1.96 Å. The W(1)-O(8) bond length is 2.21 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 WO6 octahedra that share corners with three equivalent Al(1)O5 square pyramids and edges with two equivalent W(1)O6 octahedra. The W(2)-O(3) bond length is 2.00 Å. The W(2)-O(4) bond length is 2.07 Å. The W(2)-O(5) bond length is 2.01 Å. The W(2)-O(6) bond length is 1.87 Å. The W(2)-O(7) bond length is 2.10 Å. The W(2)-O(8) bond length is 2.12 Å. Cu(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(3), one O(6), and one O(7) atom. The Cu(1)-O(1) bond length is 2.58 Å. The Cu(1)-O(2) bond length is 1.93 Å. The Cu(1)-O(3) bond length is 2.52 Å. The Cu(1)-O(6) bond length is 2.47 Å. The Cu(1)-O(7) bond length is 1.91 Å. Al(1) is bonded to one O(1), one O(2), one O(5), one O(6), and one O(8) atom to form distorted AlO5 square pyramids that share corners with three equivalent W(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 29-53°. The Al(1)-O(1) bond length is 1.93 Å. The Al(1)-O(2) bond length is 1.90 Å. The Al(1)-O(5) bond length is 1.85 Å. The Al(1)-O(6) bond length is 1.95 Å. The Al(1)-O(8) bond length is 1.88 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Mg(1), one W(1), one Cu(1), and one Al(1) atom. In the second O site, O(2) is bonded to one Mg(1), one W(1), one Cu(1), and one Al(1) atom to form corner-sharing OMgAlCuW tetrahedra. In the third O site, O(3) is bonded to one Mg(1), one W(1), one W(2), and one Cu(1) atom to form distorted corner-sharing OMgCuW2 trigonal pyramids. In the fourth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Mg(1), one W(1), and one W(2) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(2), and one Al(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Mg(1), one W(2), one Cu(1), and one Al(1) atom. In the seventh O site, O(7) is bonded in a trigonal non-coplanar geometry to one W(1), one W(2), and one Cu(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one W(1), one W(2), and one Al(1) atom.