MgCr2(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one W(2)O6 octahedra, corners with three equivalent W(1)O6 octahedra, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-58°. 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 Mg(1)O4 tetrahedra and edges with two equivalent W(2)O6 octahedra. In the second W site, W(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the second Cr site, Cr(2) is bonded in a 5-coordinate geometry to one O(1), one O(5), one O(6), one O(7), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Cr(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(2), one Cr(1), and one Cr(2) atom. In the sixth O site, O(6) is bonded to one Mg(1), one W(2), one Cr(1), and one Cr(2) atom to form distorted face-sharing OMgCr2W trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one W(1), one Cr(1), and one Cr(2) atom. In the eighth O site, O(8) is bonded to one Mg(1), one W(1), one Cr(1), and one Cr(2) atom to form distorted face-sharing OMgCr2W trigonal pyramids.
MgCr2(WO4)2 crystallizes in the triclinic P1 space group. Mg(1) is bonded to one O(2), one O(3), one O(6), and one O(8) atom to form distorted MgO4 tetrahedra that share  a cornercorner with one W(2)O6 octahedra, corners with three equivalent W(1)O6 octahedra, and  an edgeedge with one W(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 5-58°. The Mg(1)-O(2) bond length is 1.93 Å. The Mg(1)-O(3) bond length is 1.93 Å. The Mg(1)-O(6) bond length is 2.02 Å. The Mg(1)-O(8) bond length is 2.02 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 Mg(1)O4 tetrahedra and edges with two equivalent W(2)O6 octahedra. The W(1)-O(1) bond length is 2.18 Å. The W(1)-O(2) bond length is 2.05 Å. The W(1)-O(3) bond length is 2.10 Å. The W(1)-O(4) bond length is 2.07 Å. The W(1)-O(7) bond length is 2.01 Å. The W(1)-O(8) bond length is 2.11 Å. In the second W site, W(2) is bonded to one O(1), one O(2), one O(3), one O(4), one O(5), and one O(6) atom to form WO6 octahedra that share  a cornercorner with one Mg(1)O4 tetrahedra, edges with two equivalent W(1)O6 octahedra, and  an edgeedge with one Mg(1)O4 tetrahedra. The W(2)-O(1) bond length is 2.01 Å. The W(2)-O(2) bond length is 2.12 Å. The W(2)-O(3) bond length is 2.05 Å. The W(2)-O(4) bond length is 2.13 Å. The W(2)-O(5) bond length is 2.05 Å. The W(2)-O(6) bond length is 2.12 Å. There are two inequivalent Cr sites. In the first Cr site, Cr(1) is bonded in a 5-coordinate geometry to one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The Cr(1)-O(4) bond length is 1.97 Å. The Cr(1)-O(5) bond length is 1.99 Å. The Cr(1)-O(6) bond length is 2.12 Å. The Cr(1)-O(7) bond length is 1.98 Å. The Cr(1)-O(8) bond length is 2.09 Å. In the second Cr site, Cr(2) is bonded in a 5-coordinate geometry to one O(1), one O(5), one O(6), one O(7), and one O(8) atom. The Cr(2)-O(1) bond length is 1.96 Å. The Cr(2)-O(5) bond length is 1.99 Å. The Cr(2)-O(6) bond length is 2.14 Å. The Cr(2)-O(7) bond length is 1.97 Å. The Cr(2)-O(8) bond length is 2.11 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Cr(2) atom. In the second O site, O(2) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(2) atom. In the third O site, O(3) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one W(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to one W(1), one W(2), and one Cr(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one W(2), one Cr(1), and one Cr(2) atom. In the sixth O site, O(6) is bonded to one Mg(1), one W(2), one Cr(1), and one Cr(2) atom to form distorted face-sharing OMgCr2W trigonal pyramids. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one W(1), one Cr(1), and one Cr(2) atom. In the eighth O site, O(8) is bonded to one Mg(1), one W(1), one Cr(1), and one Cr(2) atom to form distorted face-sharing OMgCr2W trigonal pyramids.