MgHo6WO12 is Corundum-derived structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Ho(1)O6 pentagonal pyramids and edges with six equivalent Ho(1)O6 pentagonal pyramids. Ho(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted HoO6 pentagonal pyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(1)O6 octahedra, corners with four equivalent Ho(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 Ho(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 33-47°. W(1) is bonded to six equivalent O(2) atoms to form WO6 octahedra that share corners with six equivalent Ho(1)O6 pentagonal pyramids and edges with six equivalent Ho(1)O6 pentagonal pyramids. There are two inequivalent O sites. In the first O site, O(1) is bonded in a see-saw-like geometry to one Mg(1) and three equivalent Ho(1) atoms. In the second O site, O(2) is bonded to three equivalent Ho(1) and one W(1) atom to form a mixture of edge and corner-sharing OHo3W trigonal pyramids.
MgHo6WO12 is Corundum-derived structured and crystallizes in the trigonal R-3 space group. Mg(1) is bonded to six equivalent O(1) atoms to form MgO6 octahedra that share corners with six equivalent Ho(1)O6 pentagonal pyramids and edges with six equivalent Ho(1)O6 pentagonal pyramids. All Mg(1)-O(1) bond lengths are 2.11 Å. Ho(1) is bonded to three equivalent O(1) and three equivalent O(2) atoms to form distorted HoO6 pentagonal pyramids that share  a cornercorner with one Mg(1)O6 octahedra,  a cornercorner with one W(1)O6 octahedra, corners with four equivalent Ho(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 Ho(1)O6 pentagonal pyramids. The corner-sharing octahedral tilt angles range from 33-47°. There are two shorter (2.24 Å) and one longer (2.25 Å) Ho(1)-O(1) bond length. There are a spread of Ho(1)-O(2) bond distances ranging from 2.23-2.40 Å. W(1) is bonded to six equivalent O(2) atoms to form WO6 octahedra that share corners with six equivalent Ho(1)O6 pentagonal pyramids and edges with six equivalent Ho(1)O6 pentagonal pyramids. All W(1)-O(2) bond lengths are 2.11 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a see-saw-like geometry to one Mg(1) and three equivalent Ho(1) atoms. In the second O site, O(2) is bonded to three equivalent Ho(1) and one W(1) atom to form a mixture of edge and corner-sharing OHo3W trigonal pyramids.