Na3Mg is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Na(1) is bonded to eight equivalent Na(1) and four equivalent Mg(1) atoms to form NaNa8Mg4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Mg4 cuboctahedra, faces with four equivalent Mg(1)Na12 cuboctahedra, and faces with fourteen equivalent Na(1)Na8Mg4 cuboctahedra. Mg(1) is bonded to twelve equivalent Na(1) atoms to form MgNa12 cuboctahedra that share corners with twelve equivalent Mg(1)Na12 cuboctahedra, edges with twenty-four equivalent Na(1)Na8Mg4 cuboctahedra, faces with six equivalent Mg(1)Na12 cuboctahedra, and faces with twelve equivalent Na(1)Na8Mg4 cuboctahedra.
Na3Mg is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Na(1) is bonded to eight equivalent Na(1) and four equivalent Mg(1) atoms to form NaNa8Mg4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Mg4 cuboctahedra, edges with eight equivalent Mg(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Mg4 cuboctahedra, faces with four equivalent Mg(1)Na12 cuboctahedra, and faces with fourteen equivalent Na(1)Na8Mg4 cuboctahedra. All Na(1)-Na(1) bond lengths are 3.58 Å. All Na(1)-Mg(1) bond lengths are 3.58 Å. Mg(1) is bonded to twelve equivalent Na(1) atoms to form MgNa12 cuboctahedra that share corners with twelve equivalent Mg(1)Na12 cuboctahedra, edges with twenty-four equivalent Na(1)Na8Mg4 cuboctahedra, faces with six equivalent Mg(1)Na12 cuboctahedra, and faces with twelve equivalent Na(1)Na8Mg4 cuboctahedra.