Mg4GeSi crystallizes in the cubic F-43m space group. Mg(1) is bonded to six equivalent Mg(1), three equivalent Ge(1), and three equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing MgMg6Si3Ge3 cuboctahedra. Ge(1) is bonded in a 12-coordinate geometry to twelve equivalent Mg(1) atoms. Si(1) is bonded in a 12-coordinate geometry to twelve equivalent Mg(1) atoms.
Mg4GeSi crystallizes in the cubic F-43m space group. Mg(1) is bonded to six equivalent Mg(1), three equivalent Ge(1), and three equivalent Si(1) atoms to form a mixture of distorted corner, edge, and face-sharing MgMg6Si3Ge3 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 2.81 Å. All Mg(1)-Ge(1) bond lengths are 3.30 Å. All Mg(1)-Si(1) bond lengths are 3.29 Å. Ge(1) is bonded in a 12-coordinate geometry to twelve equivalent Mg(1) atoms. Si(1) is bonded in a 12-coordinate geometry to twelve equivalent Mg(1) atoms.