ErGa3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form ErGa12 cuboctahedra that share corners with twelve equivalent Er(1)Ga12 cuboctahedra, edges with twenty-four equivalent Ga(1)Er4Ga8 cuboctahedra, faces with six equivalent Er(1)Ga12 cuboctahedra, and faces with twelve equivalent Ga(1)Er4Ga8 cuboctahedra. Ga(1) is bonded to four equivalent Er(1) and eight equivalent Ga(1) atoms to form distorted GaEr4Ga8 cuboctahedra that share corners with twelve equivalent Ga(1)Er4Ga8 cuboctahedra, edges with eight equivalent Er(1)Ga12 cuboctahedra, edges with sixteen equivalent Ga(1)Er4Ga8 cuboctahedra, faces with four equivalent Er(1)Ga12 cuboctahedra, and faces with fourteen equivalent Ga(1)Er4Ga8 cuboctahedra.
ErGa3 is Uranium Silicide structured and crystallizes in the cubic Pm-3m space group. Er(1) is bonded to twelve equivalent Ga(1) atoms to form ErGa12 cuboctahedra that share corners with twelve equivalent Er(1)Ga12 cuboctahedra, edges with twenty-four equivalent Ga(1)Er4Ga8 cuboctahedra, faces with six equivalent Er(1)Ga12 cuboctahedra, and faces with twelve equivalent Ga(1)Er4Ga8 cuboctahedra. All Er(1)-Ga(1) bond lengths are 2.98 Å. Ga(1) is bonded to four equivalent Er(1) and eight equivalent Ga(1) atoms to form distorted GaEr4Ga8 cuboctahedra that share corners with twelve equivalent Ga(1)Er4Ga8 cuboctahedra, edges with eight equivalent Er(1)Ga12 cuboctahedra, edges with sixteen equivalent Ga(1)Er4Ga8 cuboctahedra, faces with four equivalent Er(1)Ga12 cuboctahedra, and faces with fourteen equivalent Ga(1)Er4Ga8 cuboctahedra. All Ga(1)-Ga(1) bond lengths are 2.98 Å.