Na3Ca 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 Ca(1) atoms to form NaNa8Ca4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Ca4 cuboctahedra, edges with eight equivalent Ca(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Ca4 cuboctahedra, faces with four equivalent Ca(1)Na12 cuboctahedra, and faces with fourteen equivalent Na(1)Na8Ca4 cuboctahedra. Ca(1) is bonded to twelve equivalent Na(1) atoms to form CaNa12 cuboctahedra that share corners with twelve equivalent Ca(1)Na12 cuboctahedra, edges with twenty-four equivalent Na(1)Na8Ca4 cuboctahedra, faces with six equivalent Ca(1)Na12 cuboctahedra, and faces with twelve equivalent Na(1)Na8Ca4 cuboctahedra.
Na3Ca 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 Ca(1) atoms to form NaNa8Ca4 cuboctahedra that share corners with twelve equivalent Na(1)Na8Ca4 cuboctahedra, edges with eight equivalent Ca(1)Na12 cuboctahedra, edges with sixteen equivalent Na(1)Na8Ca4 cuboctahedra, faces with four equivalent Ca(1)Na12 cuboctahedra, and faces with fourteen equivalent Na(1)Na8Ca4 cuboctahedra. All Na(1)-Na(1) bond lengths are 3.79 Å. All Na(1)-Ca(1) bond lengths are 3.79 Å. Ca(1) is bonded to twelve equivalent Na(1) atoms to form CaNa12 cuboctahedra that share corners with twelve equivalent Ca(1)Na12 cuboctahedra, edges with twenty-four equivalent Na(1)Na8Ca4 cuboctahedra, faces with six equivalent Ca(1)Na12 cuboctahedra, and faces with twelve equivalent Na(1)Na8Ca4 cuboctahedra.