Al5Cu6Mg2 crystallizes in the cubic Pm-3 space group. Mg(1) is bonded in a 15-coordinate geometry to one Mg(1), six equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 6-coordinate geometry to two equivalent Al(1) and four equivalent Al(2) atoms. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to three equivalent Mg(1), five equivalent Cu(1), one Al(1), one Al(3), and two equivalent Al(2) atoms. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to four equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to three equivalent Mg(1), three equivalent Cu(1), and three equivalent Cu(2) atoms. In the third Al site, Al(3) is bonded in a cuboctahedral geometry to twelve equivalent Cu(1) atoms.
Al5Cu6Mg2 crystallizes in the cubic Pm-3 space group. Mg(1) is bonded in a 15-coordinate geometry to one Mg(1), six equivalent Cu(1), four equivalent Al(1), and four equivalent Al(2) atoms. The Mg(1)-Mg(1) bond length is 2.93 Å. There are two shorter (2.81 Å) and four longer (2.83 Å) Mg(1)-Cu(1) bond lengths. There are two shorter (2.96 Å) and two longer (3.10 Å) Mg(1)-Al(1) bond lengths. All Mg(1)-Al(2) bond lengths are 3.04 Å. There are two inequivalent Cu sites. In the first Cu site, Cu(2) is bonded in a 6-coordinate geometry to two equivalent Al(1) and four equivalent Al(2) atoms. Both Cu(2)-Al(1) bond lengths are 2.62 Å. All Cu(2)-Al(2) bond lengths are 2.52 Å. In the second Cu site, Cu(1) is bonded in a 12-coordinate geometry to three equivalent Mg(1), five equivalent Cu(1), one Al(1), one Al(3), and two equivalent Al(2) atoms. There are four shorter (2.59 Å) and one longer (2.71 Å) Cu(1)-Cu(1) bond length. The Cu(1)-Al(1) bond length is 2.43 Å. The Cu(1)-Al(3) bond length is 2.49 Å. Both Cu(1)-Al(2) bond lengths are 2.51 Å. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded in a 4-coordinate geometry to four equivalent Mg(1), two equivalent Cu(1), and two equivalent Cu(2) atoms. In the second Al site, Al(2) is bonded in a 6-coordinate geometry to three equivalent Mg(1), three equivalent Cu(1), and three equivalent Cu(2) atoms. In the third Al site, Al(3) is bonded in a cuboctahedral geometry to twelve equivalent Cu(1) atoms.