MgLa crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Mg(2); two equivalent La(2); and six La(1,1,1) atoms to form distorted MgLa8Mg4 cuboctahedra that share corners with eighteen La(1,1,1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six equivalent Mg(1)La8Mg4 cuboctahedra; faces with two equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with six La(1,1,1)La5Mg7 cuboctahedra. In the second Mg site, Mg(2) is bonded in a 7-coordinate geometry to two equivalent Mg(1); three equivalent La(2); and four La(1,1) atoms. There are four inequivalent La sites. In the first La site, La(1) is bonded to three equivalent Mg(1); four equivalent Mg(2); two equivalent La(2); and three La(1,1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine La(1,1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six equivalent La(1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1,1)La5Mg7 cuboctahedra. In the second La site, La(1) is bonded to three equivalent Mg(1), four equivalent Mg(2), two equivalent La(2), and three equivalent La(1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine equivalent La(1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six La(1,1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1)La5Mg7 cuboctahedra. In the third La site, La(2) is bonded to two equivalent Mg(1); six equivalent Mg(2); and four La(1,1) atoms to form distorted LaLa4Mg8 cuboctahedra that share edges with four equivalent Mg(1)La8Mg4 cuboctahedra; edges with six equivalent La(2)La4Mg8 cuboctahedra; edges with eight La(1,1,1)La5Mg7 cuboctahedra; faces with two equivalent La(2)La4Mg8 cuboctahedra; faces with four equivalent Mg(1)La8Mg4 cuboctahedra; and faces with eight La(1,1,1)La5Mg7 cuboctahedra. In the fourth La site, La(1) is bonded to three equivalent Mg(1), four equivalent Mg(2), two equivalent La(2), and three equivalent La(1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine equivalent La(1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six La(1,1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1)La5Mg7 cuboctahedra.
MgLa crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Mg(2); two equivalent La(2); and six La(1,1,1) atoms to form distorted MgLa8Mg4 cuboctahedra that share corners with eighteen La(1,1,1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six equivalent Mg(1)La8Mg4 cuboctahedra; faces with two equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with six La(1,1,1)La5Mg7 cuboctahedra. All Mg(1)-Mg(2) bond lengths are 3.48 Å. Both Mg(1)-La(2) bond lengths are 3.38 Å. There are a spread of Mg(1)-La(1,1,1) bond distances ranging from 3.43-3.63 Å. In the second Mg site, Mg(2) is bonded in a 7-coordinate geometry to two equivalent Mg(1); three equivalent La(2); and four La(1,1) atoms. There are a spread of Mg(2)-La(2) bond distances ranging from 3.38-3.65 Å. There are two shorter (3.44 Å) and two longer (3.46 Å) Mg(2)-La(1,1) bond lengths. There are four inequivalent La sites. In the first La site, La(1) is bonded to three equivalent Mg(1); four equivalent Mg(2); two equivalent La(2); and three La(1,1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine La(1,1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six equivalent La(1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1,1)La5Mg7 cuboctahedra. Both La(1)-La(2) bond lengths are 3.62 Å. There are two shorter (3.41 Å) and one longer (3.78 Å) La(1)-La(1,1) bond length. In the second La site, La(1) is bonded to three equivalent Mg(1), four equivalent Mg(2), two equivalent La(2), and three equivalent La(1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine equivalent La(1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six La(1,1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1)La5Mg7 cuboctahedra. Both La(1)-La(2) bond lengths are 3.62 Å. In the third La site, La(2) is bonded to two equivalent Mg(1); six equivalent Mg(2); and four La(1,1) atoms to form distorted LaLa4Mg8 cuboctahedra that share edges with four equivalent Mg(1)La8Mg4 cuboctahedra; edges with six equivalent La(2)La4Mg8 cuboctahedra; edges with eight La(1,1,1)La5Mg7 cuboctahedra; faces with two equivalent La(2)La4Mg8 cuboctahedra; faces with four equivalent Mg(1)La8Mg4 cuboctahedra; and faces with eight La(1,1,1)La5Mg7 cuboctahedra. In the fourth La site, La(1) is bonded to three equivalent Mg(1), four equivalent Mg(2), two equivalent La(2), and three equivalent La(1) atoms to form distorted LaLa5Mg7 cuboctahedra that share corners with nine equivalent Mg(1)La8Mg4 cuboctahedra; corners with nine equivalent La(1)La5Mg7 cuboctahedra; edges with four equivalent La(2)La4Mg8 cuboctahedra; edges with six La(1,1)La5Mg7 cuboctahedra; faces with three equivalent Mg(1)La8Mg4 cuboctahedra; faces with four equivalent La(2)La4Mg8 cuboctahedra; and faces with five La(1,1)La5Mg7 cuboctahedra. There are two shorter (3.44 Å) and two longer (3.46 Å) La(1)-Mg(2) bond lengths. Both La(1)-La(2) bond lengths are 3.62 Å.