Mg(WO3)4 crystallizes in the tetragonal P4/m space group. Mg(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form MgO12 cuboctahedra that share faces with two equivalent Mg(1)O12 cuboctahedra and faces with eight equivalent W(1)O6 octahedra. W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with six equivalent W(1)O6 octahedra and faces with two equivalent Mg(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-9°. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent W(1) atoms.
Mg(WO3)4 crystallizes in the tetragonal P4/m space group. Mg(1) is bonded to four equivalent O(1) and eight equivalent O(3) atoms to form MgO12 cuboctahedra that share faces with two equivalent Mg(1)O12 cuboctahedra and faces with eight equivalent W(1)O6 octahedra. All Mg(1)-O(1) bond lengths are 2.65 Å. All Mg(1)-O(3) bond lengths are 2.66 Å. W(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form WO6 octahedra that share corners with six equivalent W(1)O6 octahedra and faces with two equivalent Mg(1)O12 cuboctahedra. The corner-sharing octahedral tilt angles range from 2-9°. Both W(1)-O(1) bond lengths are 1.95 Å. Both W(1)-O(2) bond lengths are 1.92 Å. Both W(1)-O(3) bond lengths are 1.98 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a distorted T-shaped geometry to one Mg(1) and two equivalent W(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent W(1) atoms. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent W(1) atoms.