MgCr(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-69°. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. 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 distorted WO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one W(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Mg(1) and one W(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one W(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one W(1), one W(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mg(1), one W(2), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mg(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one W(1), one W(2), and one Cr(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one W(1), one W(2), and one Cr(1) atom.
MgCr(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(1), one O(4), one O(5), and one O(6) atom to form MgO4 tetrahedra that share corners with two equivalent Cr(1)O6 octahedra and corners with three equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 44-69°. The Mg(1)-O(1) bond length is 1.95 Å. The Mg(1)-O(4) bond length is 2.07 Å. The Mg(1)-O(5) bond length is 2.02 Å. The Mg(1)-O(6) bond length is 1.98 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom. The W(1)-O(1) bond length is 1.79 Å. The W(1)-O(2) bond length is 1.83 Å. The W(1)-O(3) bond length is 2.15 Å. The W(1)-O(4) bond length is 2.30 Å. The W(1)-O(7) bond length is 1.97 Å. The W(1)-O(8) bond length is 1.94 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 distorted WO6 octahedra that share  a cornercorner with one Cr(1)O6 octahedra, corners with three equivalent Mg(1)O4 tetrahedra, and edges with two equivalent Cr(1)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. The W(2)-O(3) bond length is 2.01 Å. The W(2)-O(4) bond length is 2.11 Å. The W(2)-O(5) bond length is 1.97 Å. The W(2)-O(6) bond length is 1.80 Å. The W(2)-O(7) bond length is 2.10 Å. The W(2)-O(8) bond length is 2.21 Å. Cr(1) is bonded to one O(2), one O(3), one O(4), one O(5), one O(7), and one O(8) atom to form CrO6 octahedra that share  a cornercorner with one W(2)O6 octahedra, corners with two equivalent Mg(1)O4 tetrahedra, and edges with two equivalent W(2)O6 octahedra. The corner-sharing octahedral tilt angles are 24°. The Cr(1)-O(2) bond length is 2.04 Å. The Cr(1)-O(3) bond length is 1.98 Å. The Cr(1)-O(4) bond length is 2.08 Å. The Cr(1)-O(5) bond length is 2.02 Å. The Cr(1)-O(7) bond length is 2.04 Å. The Cr(1)-O(8) bond length is 2.09 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to one Mg(1) and one W(1) atom. In the second O site, O(2) is bonded in a water-like geometry to one W(1) and one Cr(1) atom. In the third O site, O(3) is bonded in a distorted T-shaped geometry to one W(1), one W(2), and one Cr(1) atom. In the fourth O site, O(4) is bonded in a distorted rectangular see-saw-like geometry to one Mg(1), one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a trigonal non-coplanar geometry to one Mg(1), one W(2), and one Cr(1) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mg(1) and one W(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one W(1), one W(2), and one Cr(1) atom. In the eighth O site, O(8) is bonded in a trigonal non-coplanar geometry to one W(1), one W(2), and one Cr(1) atom.