MgSi crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to eight 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 9-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), and two equivalent Si(1) atoms.
MgSi crystallizes in the orthorhombic Cmcm space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to eight equivalent Si(1) atoms. There are four shorter (2.82 Å) and four longer (3.07 Å) Mg(1)-Si(1) bond lengths. In the second Mg site, Mg(2) is bonded in a 6-coordinate geometry to six equivalent Si(1) atoms. There are two shorter (2.82 Å) and four longer (2.85 Å) Mg(2)-Si(1) bond lengths. Si(1) is bonded in a 9-coordinate geometry to three equivalent Mg(2), four equivalent Mg(1), and two equivalent Si(1) atoms. There is one shorter (2.34 Å) and one longer (2.40 Å) Si(1)-Si(1) bond length.