Mg(WO2)2 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. In the second W site, W(2) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and three equivalent W(2) atoms to form distorted OMg2W3 trigonal bipyramids that share  a cornercorner with one O(2)MgW3 tetrahedra, corners with two equivalent O(3)Mg2W3 trigonal bipyramids, corners with six equivalent O(4)Mg2W3 trigonal bipyramids, edges with two equivalent O(2)MgW3 tetrahedra,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(4)Mg2W3 trigonal bipyramids, and edges with four equivalent O(1)Mg2W3 trigonal bipyramids. In the second O site, O(2) is bonded to one Mg(1), one W(2), and two equivalent W(1) atoms to form OMgW3 tetrahedra that share corners with two equivalent O(2)MgW3 tetrahedra,  a cornercorner with one O(1)Mg2W3 trigonal bipyramid, corners with two equivalent O(4)Mg2W3 trigonal bipyramids, corners with six equivalent O(3)Mg2W3 trigonal bipyramids,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(1)Mg2W3 trigonal bipyramids, and edges with two equivalent O(4)Mg2W3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Mg(1) and three equivalent W(1) atoms to form distorted OMg2W3 trigonal bipyramids that share corners with six equivalent O(2)MgW3 tetrahedra, corners with two equivalent O(1)Mg2W3 trigonal bipyramids, corners with five equivalent O(4)Mg2W3 trigonal bipyramids,  an edgeedge with one O(2)MgW3 tetrahedra,  an edgeedge with one O(1)Mg2W3 trigonal bipyramid,  an edgeedge with one O(4)Mg2W3 trigonal bipyramid, and edges with four equivalent O(3)Mg2W3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Mg(1), one W(1), and two equivalent W(2) atoms to form distorted OMg2W3 trigonal bipyramids that share corners with two equivalent O(2)MgW3 tetrahedra, corners with five equivalent O(3)Mg2W3 trigonal bipyramids, corners with six equivalent O(1)Mg2W3 trigonal bipyramids, edges with two equivalent O(2)MgW3 tetrahedra,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(1)Mg2W3 trigonal bipyramids, and edges with two equivalent O(4)Mg2W3 trigonal bipyramids.
Mg(WO2)2 crystallizes in the orthorhombic Pnma space group. Mg(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms. The Mg(1)-O(2) bond length is 2.15 Å. Both Mg(1)-O(1) bond lengths are 2.35 Å. Both Mg(1)-O(3) bond lengths are 2.37 Å. Both Mg(1)-O(4) bond lengths are 2.43 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded to one O(4), two equivalent O(2), and three equivalent O(3) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. The W(1)-O(4) bond length is 2.23 Å. Both W(1)-O(2) bond lengths are 2.11 Å. There is one shorter (2.22 Å) and two longer (2.25 Å) W(1)-O(3) bond lengths. In the second W site, W(2) is bonded to one O(2), two equivalent O(4), and three equivalent O(1) atoms to form a mixture of edge and corner-sharing WO6 octahedra. The corner-sharing octahedral tilt angles range from 54-66°. The W(2)-O(2) bond length is 2.12 Å. Both W(2)-O(4) bond lengths are 2.20 Å. There is one shorter (2.21 Å) and two longer (2.23 Å) W(2)-O(1) bond lengths. There are four inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Mg(1) and three equivalent W(2) atoms to form distorted OMg2W3 trigonal bipyramids that share  a cornercorner with one O(2)MgW3 tetrahedra, corners with two equivalent O(3)Mg2W3 trigonal bipyramids, corners with six equivalent O(4)Mg2W3 trigonal bipyramids, edges with two equivalent O(2)MgW3 tetrahedra,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(4)Mg2W3 trigonal bipyramids, and edges with four equivalent O(1)Mg2W3 trigonal bipyramids. In the second O site, O(2) is bonded to one Mg(1), one W(2), and two equivalent W(1) atoms to form OMgW3 tetrahedra that share corners with two equivalent O(2)MgW3 tetrahedra,  a cornercorner with one O(1)Mg2W3 trigonal bipyramid, corners with two equivalent O(4)Mg2W3 trigonal bipyramids, corners with six equivalent O(3)Mg2W3 trigonal bipyramids,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(1)Mg2W3 trigonal bipyramids, and edges with two equivalent O(4)Mg2W3 trigonal bipyramids. In the third O site, O(3) is bonded to two equivalent Mg(1) and three equivalent W(1) atoms to form distorted OMg2W3 trigonal bipyramids that share corners with six equivalent O(2)MgW3 tetrahedra, corners with two equivalent O(1)Mg2W3 trigonal bipyramids, corners with five equivalent O(4)Mg2W3 trigonal bipyramids,  an edgeedge with one O(2)MgW3 tetrahedra,  an edgeedge with one O(1)Mg2W3 trigonal bipyramid,  an edgeedge with one O(4)Mg2W3 trigonal bipyramid, and edges with four equivalent O(3)Mg2W3 trigonal bipyramids. In the fourth O site, O(4) is bonded to two equivalent Mg(1), one W(1), and two equivalent W(2) atoms to form distorted OMg2W3 trigonal bipyramids that share corners with two equivalent O(2)MgW3 tetrahedra, corners with five equivalent O(3)Mg2W3 trigonal bipyramids, corners with six equivalent O(1)Mg2W3 trigonal bipyramids, edges with two equivalent O(2)MgW3 tetrahedra,  an edgeedge with one O(3)Mg2W3 trigonal bipyramid, edges with two equivalent O(1)Mg2W3 trigonal bipyramids, and edges with two equivalent O(4)Mg2W3 trigonal bipyramids.