Mg2Si crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to six equivalent Mg(2) and five equivalent Si(1) atoms. In the second Mg site, Mg(2) is bonded in a 14-coordinate geometry to two equivalent Mg(2), six equivalent Mg(1), and six equivalent Si(1) atoms. Si(1) is bonded in a 11-coordinate geometry to five equivalent Mg(1) and six equivalent Mg(2) atoms.
Mg2Si crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 5-coordinate geometry to six equivalent Mg(2) and five equivalent Si(1) atoms. There are a spread of Mg(1)-Mg(2) bond distances ranging from 3.06-3.11 Å. There are a spread of Mg(1)-Si(1) bond distances ranging from 2.65-3.08 Å. In the second Mg site, Mg(2) is bonded in a 14-coordinate geometry to two equivalent Mg(2), six equivalent Mg(1), and six equivalent Si(1) atoms. Both Mg(2)-Mg(2) bond lengths are 3.07 Å. There are a spread of Mg(2)-Si(1) bond distances ranging from 2.98-3.19 Å. Si(1) is bonded in a 11-coordinate geometry to five equivalent Mg(1) and six equivalent Mg(2) atoms.