Mg7W crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent Mg(3) and two equivalent W(1) atoms. In the second Mg site, Mg(2) is bonded in a distorted water-like geometry to two equivalent Mg(3) and two equivalent W(1) atoms. In the third Mg site, Mg(3) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra, faces with two equivalent Mg(3)Mg12 cuboctahedra, and faces with six equivalent W(1)Mg12 cuboctahedra. W(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form WMg12 cuboctahedra that share corners with six equivalent W(1)Mg12 cuboctahedra, faces with two equivalent W(1)Mg12 cuboctahedra, and faces with six equivalent Mg(3)Mg12 cuboctahedra.
Mg7W crystallizes in the hexagonal P-6m2 space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted linear geometry to two equivalent Mg(3) and two equivalent W(1) atoms. Both Mg(1)-Mg(3) bond lengths are 3.06 Å. Both Mg(1)-W(1) bond lengths are 3.10 Å. In the second Mg site, Mg(2) is bonded in a distorted water-like geometry to two equivalent Mg(3) and two equivalent W(1) atoms. Both Mg(2)-Mg(3) bond lengths are 3.10 Å. Both Mg(2)-W(1) bond lengths are 2.99 Å. In the third Mg site, Mg(3) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form MgMg12 cuboctahedra that share corners with six equivalent Mg(3)Mg12 cuboctahedra, faces with two equivalent Mg(3)Mg12 cuboctahedra, and faces with six equivalent W(1)Mg12 cuboctahedra. W(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form WMg12 cuboctahedra that share corners with six equivalent W(1)Mg12 cuboctahedra, faces with two equivalent W(1)Mg12 cuboctahedra, and faces with six equivalent Mg(3)Mg12 cuboctahedra.