MgSi crystallizes in the triclinic P-1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to two equivalent Mg(2), four equivalent Mg(3), one Si(1), and four equivalent Si(3) atoms. In the second Mg site, Mg(2) is bonded in a 13-coordinate geometry to two equivalent Mg(1), three equivalent Mg(3), one Si(3), three equivalent Si(2), and four equivalent Si(1) atoms. In the third Mg site, Mg(3) is bonded in a 14-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), two equivalent Si(1), two equivalent Si(2), and three equivalent Si(3) atoms. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), four equivalent Mg(2), and three equivalent Si(2) atoms. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Mg(3), three equivalent Mg(2), one Si(2), and three equivalent Si(1) atoms. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Mg(2), three equivalent Mg(3), four equivalent Mg(1), and one Si(3) atom.
MgSi crystallizes in the triclinic P-1 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to two equivalent Mg(2), four equivalent Mg(3), one Si(1), and four equivalent Si(3) atoms. There is one shorter (3.12 Å) and one longer (3.39 Å) Mg(1)-Mg(2) bond length. There are a spread of Mg(1)-Mg(3) bond distances ranging from 3.09-3.29 Å. The Mg(1)-Si(1) bond length is 2.75 Å. There are a spread of Mg(1)-Si(3) bond distances ranging from 2.75-2.99 Å. In the second Mg site, Mg(2) is bonded in a 13-coordinate geometry to two equivalent Mg(1), three equivalent Mg(3), one Si(3), three equivalent Si(2), and four equivalent Si(1) atoms. There are a spread of Mg(2)-Mg(3) bond distances ranging from 3.10-3.32 Å. The Mg(2)-Si(3) bond length is 2.70 Å. There are a spread of Mg(2)-Si(2) bond distances ranging from 2.80-2.84 Å. There are a spread of Mg(2)-Si(1) bond distances ranging from 2.77-3.19 Å. In the third Mg site, Mg(3) is bonded in a 14-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), two equivalent Si(1), two equivalent Si(2), and three equivalent Si(3) atoms. There is one shorter (2.95 Å) and one longer (3.16 Å) Mg(3)-Si(1) bond length. There is one shorter (2.99 Å) and one longer (3.06 Å) Mg(3)-Si(2) bond length. There are two shorter (2.88 Å) and one longer (3.23 Å) Mg(3)-Si(3) bond length. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded in a 10-coordinate geometry to one Mg(1), two equivalent Mg(3), four equivalent Mg(2), and three equivalent Si(2) atoms. There is one shorter (2.50 Å) and two longer (2.59 Å) Si(1)-Si(2) bond lengths. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to two equivalent Mg(3), three equivalent Mg(2), one Si(2), and three equivalent Si(1) atoms. The Si(2)-Si(2) bond length is 2.45 Å. In the third Si site, Si(3) is bonded in a 8-coordinate geometry to one Mg(2), three equivalent Mg(3), four equivalent Mg(1), and one Si(3) atom. The Si(3)-Si(3) bond length is 2.46 Å.