MgSi crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. Si(1) is bonded in a 8-coordinate geometry to three equivalent Mg(1), three equivalent Mg(2), and two equivalent Si(1) atoms.
MgSi crystallizes in the monoclinic P2_1/m space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are a spread of Mg(1)-Si(1) bond distances ranging from 2.81-2.97 Å. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are a spread of Mg(2)-Si(1) bond distances ranging from 2.76-2.87 Å. Si(1) is bonded in a 8-coordinate geometry to three equivalent Mg(1), three equivalent Mg(2), and two equivalent Si(1) atoms. There is one shorter (2.40 Å) and one longer (2.41 Å) Si(1)-Si(1) bond length.