MgGd6WO12 is Corundum-derived structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Gd(1)O6 pentagonal pyramids and edges with six equivalent Gd(1)O6 pentagonal pyramids. Gd(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted GdO6 pentagonal pyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(1)O6 octahedra, corners with four equivalent Gd(1)O6 pentagonal pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one W(1)O6 octahedra, and edges with four equivalent Gd(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 32-46°. W(1) is bonded to six equivalent O(1) atoms to form WO6 octahedra that share corners with six equivalent Gd(1)O6 pentagonal pyramids and edges with six equivalent Gd(1)O6 pentagonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Gd(1) and one W(1) atom to form a mixture of edge and corner-sharing OGd3W trigonal pyramids. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Mg(1) and three equivalent Gd(1) atoms.
MgGd6WO12 is Corundum-derived structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(2) atoms to form MgO6 octahedra that share corners with six equivalent Gd(1)O6 pentagonal pyramids and edges with six equivalent Gd(1)O6 pentagonal pyramids. All Mg(1)-O(2) bond lengths are 2.13 Å. Gd(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted GdO6 pentagonal pyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(1)O6 octahedra, corners with four equivalent Gd(1)O6 pentagonal pyramids,  an edgeedge with one Mg(1)O6 octahedra,  an edgeedge with one W(1)O6 octahedra, and edges with four equivalent Gd(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 32-46°. There are a spread of Gd(1)-O(1) bond distances ranging from 2.29-2.43 Å. There are two shorter (2.29 Å) and one longer (2.30 Å) Gd(1)-O(2) bond length. W(1) is bonded to six equivalent O(1) atoms to form WO6 octahedra that share corners with six equivalent Gd(1)O6 pentagonal pyramids and edges with six equivalent Gd(1)O6 pentagonal pyramids. All W(1)-O(1) bond lengths are 2.11 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Gd(1) and one W(1) atom to form a mixture of edge and corner-sharing OGd3W trigonal pyramids. In the second O site, O(2) is bonded in a distorted see-saw-like geometry to one Mg(1) and three equivalent Gd(1) atoms.