Mg6LaCu crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), one La(1), and one Cu(1) atom. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent La(1), and two equivalent Cu(1) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and two equivalent Cu(1) atoms. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), four equivalent Mg(1), and two equivalent La(1) atoms. La(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(4), four equivalent Mg(2), and two equivalent Cu(1) atoms. Cu(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent La(1) atoms.
Mg6LaCu crystallizes in the orthorhombic Amm2 space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), one La(1), and one Cu(1) atom. Both Mg(1)-Mg(2) bond lengths are 3.04 Å. Both Mg(1)-Mg(3) bond lengths are 3.44 Å. Both Mg(1)-Mg(4) bond lengths are 3.09 Å. The Mg(1)-La(1) bond length is 3.46 Å. The Mg(1)-Cu(1) bond length is 2.80 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to one Mg(3), one Mg(4), two equivalent Mg(1), two equivalent Mg(2), two equivalent La(1), and two equivalent Cu(1) atoms. The Mg(2)-Mg(3) bond length is 3.18 Å. The Mg(2)-Mg(4) bond length is 3.18 Å. There is one shorter (2.95 Å) and one longer (3.04 Å) Mg(2)-Mg(2) bond length. Both Mg(2)-La(1) bond lengths are 3.31 Å. Both Mg(2)-Cu(1) bond lengths are 2.94 Å. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(4), four equivalent Mg(1), and two equivalent Cu(1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.10 Å. Both Mg(3)-Cu(1) bond lengths are 3.33 Å. In the fourth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Mg(2), two equivalent Mg(3), four equivalent Mg(1), and two equivalent La(1) atoms. Both Mg(4)-La(1) bond lengths are 3.22 Å. La(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(4), four equivalent Mg(2), and two equivalent Cu(1) atoms. Both La(1)-Cu(1) bond lengths are 3.15 Å. Cu(1) is bonded in a 10-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), four equivalent Mg(2), and two equivalent La(1) atoms.