MgLaSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(2) atoms. La(1) is bonded in a 10-coordinate geometry to four equivalent Si(2) and six Si(1,1) atoms. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent La(1), and one Si(1) atom. In the fourth Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. In the fifth Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms.
MgLaSi2 crystallizes in the tetragonal I4_1/amd space group. Mg(1) is bonded in a distorted square co-planar geometry to four equivalent Si(2) atoms. All Mg(1)-Si(2) bond lengths are 2.80 Å. La(1) is bonded in a 10-coordinate geometry to four equivalent Si(2) and six Si(1,1) atoms. All La(1)-Si(2) bond lengths are 3.24 Å. There are two shorter (3.16 Å) and four longer (3.31 Å) La(1)-Si(1,1) bond lengths. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. The Si(1)-Si(2) bond length is 2.32 Å. Both Si(1)-Si(1) bond lengths are 2.41 Å. In the second Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. There are two shorter (3.16 Å) and four longer (3.31 Å) Si(1)-La(1) bond lengths. The Si(1)-Si(2) bond length is 2.32 Å. Both Si(1)-Si(1) bond lengths are 2.41 Å. In the third Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent Mg(1), four equivalent La(1), and one Si(1) atom. In the fourth Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. The Si(1)-Si(2) bond length is 2.32 Å. In the fifth Si site, Si(1) is bonded in a 9-coordinate geometry to six equivalent La(1), one Si(2), and two equivalent Si(1) atoms. There are two shorter (3.16 Å) and four longer (3.31 Å) Si(1)-La(1) bond lengths. The Si(1)-Si(2) bond length is 2.32 Å.