MgLa4Ir crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent La(1), three equivalent La(2), and three equivalent La(3) atoms to form a mixture of face and corner-sharing MgLa9Mg3 cuboctahedra. There are three inequivalent La sites. In the first La site, La(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Ir(1) atoms. In the second La site, La(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1) and two equivalent Ir(1) atoms. In the third La site, La(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1) and three equivalent Ir(1) atoms. Ir(1) is bonded in a 6-coordinate geometry to three equivalent La(1), three equivalent La(2), and three equivalent La(3) atoms.
MgLa4Ir crystallizes in the cubic F-43m space group. Mg(1) is bonded to three equivalent Mg(1), three equivalent La(1), three equivalent La(2), and three equivalent La(3) atoms to form a mixture of face and corner-sharing MgLa9Mg3 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.18 Å. All Mg(1)-La(1) bond lengths are 3.52 Å. All Mg(1)-La(2) bond lengths are 3.72 Å. All Mg(1)-La(3) bond lengths are 3.71 Å. There are three inequivalent La sites. In the first La site, La(1) is bonded in a distorted rectangular see-saw-like geometry to two equivalent Mg(1) and two equivalent Ir(1) atoms. Both La(1)-Ir(1) bond lengths are 3.65 Å. In the second La site, La(2) is bonded in a bent 150 degrees geometry to two equivalent Mg(1) and two equivalent Ir(1) atoms. Both La(2)-Ir(1) bond lengths are 2.95 Å. In the third La site, La(3) is bonded in a 3-coordinate geometry to three equivalent Mg(1) and three equivalent Ir(1) atoms. All La(3)-Ir(1) bond lengths are 2.95 Å. Ir(1) is bonded in a 6-coordinate geometry to three equivalent La(1), three equivalent La(2), and three equivalent La(3) atoms.