RbMg6W crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, and faces with six equivalent W(1)Mg12 cuboctahedra. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), four equivalent Mg(2), and two equivalent W(1) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Rb(1), four equivalent Mg(1), four equivalent Mg(2), and two equivalent W(1) atoms. 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 Rb(1)Mg12 cuboctahedra.
RbMg6W crystallizes in the hexagonal P-6m2 space group. Rb(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form RbMg12 cuboctahedra that share corners with six equivalent Rb(1)Mg12 cuboctahedra, faces with two equivalent Rb(1)Mg12 cuboctahedra, and faces with six equivalent W(1)Mg12 cuboctahedra. All Rb(1)-Mg(1) bond lengths are 3.23 Å. All Rb(1)-Mg(2) bond lengths are 3.23 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), four equivalent Mg(2), and two equivalent W(1) atoms. Both Mg(1)-Mg(1) bond lengths are 2.86 Å. All Mg(1)-Mg(2) bond lengths are 3.20 Å. Both Mg(1)-W(1) bond lengths are 3.05 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Rb(1), four equivalent Mg(1), four equivalent Mg(2), and two equivalent W(1) atoms. There are two shorter (3.03 Å) and two longer (3.41 Å) Mg(2)-Mg(2) bond lengths. Both Mg(2)-W(1) bond lengths are 3.22 Å. 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 Rb(1)Mg12 cuboctahedra.