MgNi(WO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share edges with two equivalent Ni(1)O6 octahedra. W(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form NiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Ni(1) atom.
MgNi(WO4)2 crystallizes in the triclinic P-1 space group. Mg(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MgO6 octahedra that share edges with two equivalent Ni(1)O6 octahedra. Both Mg(1)-O(1) bond lengths are 2.13 Å. Both Mg(1)-O(3) bond lengths are 2.06 Å. Both Mg(1)-O(4) bond lengths are 2.09 Å. W(1) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), and two equivalent O(3) atoms. The W(1)-O(1) bond length is 1.86 Å. The W(1)-O(2) bond length is 1.77 Å. The W(1)-O(4) bond length is 1.88 Å. There is one shorter (1.97 Å) and one longer (2.07 Å) W(1)-O(3) bond length. Ni(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form NiO6 octahedra that share edges with two equivalent Mg(1)O6 octahedra. Both Ni(1)-O(1) bond lengths are 2.16 Å. Both Ni(1)-O(2) bond lengths are 2.08 Å. Both Ni(1)-O(4) bond lengths are 2.09 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mg(1), one W(1), and one Ni(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one W(1) and one Ni(1) atom. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Mg(1) and two equivalent W(1) atoms. In the fourth O site, O(4) is bonded in a T-shaped geometry to one Mg(1), one W(1), and one Ni(1) atom.