MgLa crystallizes in the monoclinic Cm space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(2), three equivalent Mg(3), one La(3), two equivalent La(1), and two equivalent La(2) atoms. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), one La(1), two equivalent La(2), and three equivalent La(3) atoms. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), three equivalent Mg(1), one La(2), two equivalent La(1), and two equivalent La(3) atoms. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent La(1), two equivalent La(3), and three equivalent La(2) atoms. In the second La site, La(2) is bonded to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent La(2), two equivalent La(3), and three equivalent La(1) atoms to form distorted LaLa7Mg5 cuboctahedra that share corners with six equivalent La(2)La7Mg5 cuboctahedra, edges with six equivalent La(3)La6Mg6 cuboctahedra, faces with two equivalent La(2)La7Mg5 cuboctahedra, and faces with three equivalent La(3)La6Mg6 cuboctahedra. In the third La site, La(3) is bonded to one Mg(1), two equivalent Mg(3), three equivalent Mg(2), two equivalent La(1), two equivalent La(2), and two equivalent La(3) atoms to form distorted LaLa6Mg6 cuboctahedra that share corners with six equivalent La(3)La6Mg6 cuboctahedra, edges with six equivalent La(2)La7Mg5 cuboctahedra, faces with two equivalent La(3)La6Mg6 cuboctahedra, and faces with three equivalent La(2)La7Mg5 cuboctahedra.
MgLa crystallizes in the monoclinic Cm space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Mg(2), three equivalent Mg(3), one La(3), two equivalent La(1), and two equivalent La(2) atoms. Both Mg(1)-Mg(2) bond lengths are 3.26 Å. There are two shorter (3.41 Å) and one longer (3.48 Å) Mg(1)-Mg(3) bond length. The Mg(1)-La(3) bond length is 3.43 Å. Both Mg(1)-La(1) bond lengths are 3.49 Å. Both Mg(1)-La(2) bond lengths are 3.63 Å. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to two equivalent Mg(1), two equivalent Mg(3), one La(1), two equivalent La(2), and three equivalent La(3) atoms. Both Mg(2)-Mg(3) bond lengths are 3.21 Å. The Mg(2)-La(1) bond length is 4.09 Å. Both Mg(2)-La(2) bond lengths are 3.57 Å. There are two shorter (3.50 Å) and one longer (3.51 Å) Mg(2)-La(3) bond length. In the third Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent Mg(2), three equivalent Mg(1), one La(2), two equivalent La(1), and two equivalent La(3) atoms. The Mg(3)-La(2) bond length is 3.74 Å. Both Mg(3)-La(1) bond lengths are 3.39 Å. Both Mg(3)-La(3) bond lengths are 3.49 Å. There are three inequivalent La sites. In the first La site, La(1) is bonded in a 12-coordinate geometry to one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent La(1), two equivalent La(3), and three equivalent La(2) atoms. Both La(1)-La(1) bond lengths are 3.65 Å. Both La(1)-La(3) bond lengths are 3.56 Å. There are two shorter (3.46 Å) and one longer (3.54 Å) La(1)-La(2) bond length. In the second La site, La(2) is bonded to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent La(2), two equivalent La(3), and three equivalent La(1) atoms to form distorted LaLa7Mg5 cuboctahedra that share corners with six equivalent La(2)La7Mg5 cuboctahedra, edges with six equivalent La(3)La6Mg6 cuboctahedra, faces with two equivalent La(2)La7Mg5 cuboctahedra, and faces with three equivalent La(3)La6Mg6 cuboctahedra. Both La(2)-La(2) bond lengths are 3.65 Å. Both La(2)-La(3) bond lengths are 3.58 Å. In the third La site, La(3) is bonded to one Mg(1), two equivalent Mg(3), three equivalent Mg(2), two equivalent La(1), two equivalent La(2), and two equivalent La(3) atoms to form distorted LaLa6Mg6 cuboctahedra that share corners with six equivalent La(3)La6Mg6 cuboctahedra, edges with six equivalent La(2)La7Mg5 cuboctahedra, faces with two equivalent La(3)La6Mg6 cuboctahedra, and faces with three equivalent La(2)La7Mg5 cuboctahedra. Both La(3)-La(3) bond lengths are 3.65 Å.