Mg3Au crystallizes in the hexagonal P6_3cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to four equivalent Au(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Au(1) atoms. In the third Mg site, Mg(3) is bonded in a trigonal planar geometry to three equivalent Au(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted trigonal planar geometry to three equivalent Au(1) atoms. Au(1) is bonded in a 10-coordinate geometry to one Mg(2), two equivalent Mg(3), three equivalent Mg(4), and four equivalent Mg(1) atoms.
Mg3Au crystallizes in the hexagonal P6_3cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to four equivalent Au(1) atoms. There are a spread of Mg(1)-Au(1) bond distances ranging from 2.79-3.20 Å. In the second Mg site, Mg(2) is bonded in a distorted trigonal non-coplanar geometry to three equivalent Au(1) atoms. All Mg(2)-Au(1) bond lengths are 2.71 Å. In the third Mg site, Mg(3) is bonded in a trigonal planar geometry to three equivalent Au(1) atoms. All Mg(3)-Au(1) bond lengths are 2.73 Å. In the fourth Mg site, Mg(4) is bonded in a distorted trigonal planar geometry to three equivalent Au(1) atoms. There is one shorter (2.83 Å) and two longer (2.86 Å) Mg(4)-Au(1) bond lengths. Au(1) is bonded in a 10-coordinate geometry to one Mg(2), two equivalent Mg(3), three equivalent Mg(4), and four equivalent Mg(1) atoms.