MgFeAuO2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) and three equivalent O(2) atoms. Fe(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. Au(1) is bonded in a 4-coordinate geometry to three equivalent Mg(1) and one O(1) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Fe(1) and one Au(1) atom to form corner-sharing OFe3Au tetrahedra. In the second O site, O(2) is bonded in a 6-coordinate geometry to three equivalent Mg(1) and three equivalent Fe(1) atoms.
MgFeAuO2 crystallizes in the monoclinic Cm space group. Mg(1) is bonded in a 3-coordinate geometry to three equivalent Au(1) and three equivalent O(2) atoms. All Mg(1)-Au(1) bond lengths are 2.89 Å. All Mg(1)-O(2) bond lengths are 2.06 Å. Fe(1) is bonded in a 6-coordinate geometry to three equivalent O(1) and three equivalent O(2) atoms. All Fe(1)-O(1) bond lengths are 1.95 Å. There is one shorter (2.43 Å) and two longer (2.46 Å) Fe(1)-O(2) bond lengths. Au(1) is bonded in a 4-coordinate geometry to three equivalent Mg(1) and one O(1) atom. The Au(1)-O(1) bond length is 2.44 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to three equivalent Fe(1) and one Au(1) atom to form corner-sharing OFe3Au tetrahedra. In the second O site, O(2) is bonded in a 6-coordinate geometry to three equivalent Mg(1) and three equivalent Fe(1) atoms.