Mg2Si crystallizes in the orthorhombic Pnma 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 orthorhombic Pnma 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 3.06-3.09 Å. There are a spread of Mg(1)-Si(1) bond distances ranging from 2.66-3.12 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 2.98-3.17 Å. Si(1) is bonded in a 11-coordinate geometry to five equivalent Mg(1) and six equivalent Mg(2) atoms.