NaMg3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Na(1) is bonded to twelve Mg(1,1) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra; corners with twelve Mg(1,1)Na4Mg8 cuboctahedra; edges with eighteen Mg(1,1)Na4Mg8 cuboctahedra; faces with eight equivalent Na(1)Mg12 cuboctahedra; and faces with twelve Mg(1,1)Na4Mg8 cuboctahedra. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Na(1) and eight Mg(1,1) atoms to form distorted MgNa4Mg8 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra; corners with fourteen Mg(1,1)Na4Mg8 cuboctahedra; edges with six equivalent Na(1)Mg12 cuboctahedra; edges with twelve Mg(1,1)Na4Mg8 cuboctahedra; faces with four equivalent Na(1)Mg12 cuboctahedra; and faces with sixteen Mg(1,1)Na4Mg8 cuboctahedra. In the second Mg site, Mg(1) is bonded to four equivalent Na(1) and eight equivalent Mg(1) atoms to form distorted MgNa4Mg8 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra; corners with fourteen Mg(1,1)Na4Mg8 cuboctahedra; edges with six equivalent Na(1)Mg12 cuboctahedra; edges with twelve equivalent Mg(1)Na4Mg8 cuboctahedra; faces with four equivalent Na(1)Mg12 cuboctahedra; and faces with sixteen Mg(1,1)Na4Mg8 cuboctahedra.
NaMg3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Na(1) is bonded to twelve Mg(1,1) atoms to form NaMg12 cuboctahedra that share corners with six equivalent Na(1)Mg12 cuboctahedra; corners with twelve Mg(1,1)Na4Mg8 cuboctahedra; edges with eighteen Mg(1,1)Na4Mg8 cuboctahedra; faces with eight equivalent Na(1)Mg12 cuboctahedra; and faces with twelve Mg(1,1)Na4Mg8 cuboctahedra. There are six shorter (3.30 Å) and six longer (3.32 Å) Na(1)-Mg(1,1) bond lengths. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded to four equivalent Na(1) and eight Mg(1,1) atoms to form distorted MgNa4Mg8 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra; corners with fourteen Mg(1,1)Na4Mg8 cuboctahedra; edges with six equivalent Na(1)Mg12 cuboctahedra; edges with twelve Mg(1,1)Na4Mg8 cuboctahedra; faces with four equivalent Na(1)Mg12 cuboctahedra; and faces with sixteen Mg(1,1)Na4Mg8 cuboctahedra. There are a spread of Mg(1)-Mg(1,1) bond distances ranging from 3.22-3.38 Å. In the second Mg site, Mg(1) is bonded to four equivalent Na(1) and eight equivalent Mg(1) atoms to form distorted MgNa4Mg8 cuboctahedra that share corners with four equivalent Na(1)Mg12 cuboctahedra; corners with fourteen Mg(1,1)Na4Mg8 cuboctahedra; edges with six equivalent Na(1)Mg12 cuboctahedra; edges with twelve equivalent Mg(1)Na4Mg8 cuboctahedra; faces with four equivalent Na(1)Mg12 cuboctahedra; and faces with sixteen Mg(1,1)Na4Mg8 cuboctahedra.