Mg is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. In the third Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine Mg(2,2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra.
Mg is alpha Samarium structured and crystallizes in the trigonal R-3m space group. There are three inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to six equivalent Mg(1) and six equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. All Mg(1)-Mg(1) bond lengths are 3.19 Å. All Mg(1)-Mg(2) bond lengths are 3.16 Å. In the second Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine equivalent Mg(2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. There are three shorter (3.15 Å) and six longer (3.19 Å) Mg(2)-Mg(2) bond lengths. In the third Mg site, Mg(2) is bonded to three equivalent Mg(1) and nine Mg(2,2) atoms to form a mixture of corner, edge, and face-sharing MgMg12 cuboctahedra. All Mg(2)-Mg(1) bond lengths are 3.16 Å. There are three shorter (3.15 Å) and six longer (3.19 Å) Mg(2)-Mg(2,2) bond lengths.