Pm3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pm(1) is bonded to eight equivalent Pm(1) and four equivalent Al(1) atoms to form distorted PmPm8Al4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Al4 cuboctahedra, edges with eight equivalent Al(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Al4 cuboctahedra, faces with four equivalent Al(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Al4 cuboctahedra. Al(1) is bonded to twelve equivalent Pm(1) atoms to form AlPm12 cuboctahedra that share corners with twelve equivalent Al(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Al4 cuboctahedra, faces with six equivalent Al(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Al4 cuboctahedra.
Pm3Al is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Pm(1) is bonded to eight equivalent Pm(1) and four equivalent Al(1) atoms to form distorted PmPm8Al4 cuboctahedra that share corners with twelve equivalent Pm(1)Pm8Al4 cuboctahedra, edges with eight equivalent Al(1)Pm12 cuboctahedra, edges with sixteen equivalent Pm(1)Pm8Al4 cuboctahedra, faces with four equivalent Al(1)Pm12 cuboctahedra, and faces with fourteen equivalent Pm(1)Pm8Al4 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.43 Å. All Pm(1)-Al(1) bond lengths are 3.43 Å. Al(1) is bonded to twelve equivalent Pm(1) atoms to form AlPm12 cuboctahedra that share corners with twelve equivalent Al(1)Pm12 cuboctahedra, edges with twenty-four equivalent Pm(1)Pm8Al4 cuboctahedra, faces with six equivalent Al(1)Pm12 cuboctahedra, and faces with twelve equivalent Pm(1)Pm8Al4 cuboctahedra.