NiNiGa crystallizes in the trigonal P-3m1 space group. Ni(1) is bonded to nine equivalent Ni(1) and three equivalent Ga(1) atoms to form distorted NiGa3Ni9 cuboctahedra that share corners with three equivalent Ga(1)Ga6Ni6 cuboctahedra, corners with nine equivalent Ni(1)Ga3Ni9 cuboctahedra, edges with nine equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with fifteen equivalent Ni(1)Ga3Ni9 cuboctahedra, faces with six equivalent Ga(1)Ga6Ni6 cuboctahedra, and faces with twelve equivalent Ni(1)Ga3Ni9 cuboctahedra. Ga(1) is bonded to six equivalent Ni(1) and six equivalent Ga(1) atoms to form distorted GaGa6Ni6 cuboctahedra that share corners with six equivalent Ni(1)Ga3Ni9 cuboctahedra, corners with six equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with six equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with eighteen equivalent Ni(1)Ga3Ni9 cuboctahedra, faces with six equivalent Ga(1)Ga6Ni6 cuboctahedra, and faces with twelve equivalent Ni(1)Ga3Ni9 cuboctahedra.
NiNiGa crystallizes in the trigonal P-3m1 space group. Ni(1) is bonded to nine equivalent Ni(1) and three equivalent Ga(1) atoms to form distorted NiGa3Ni9 cuboctahedra that share corners with three equivalent Ga(1)Ga6Ni6 cuboctahedra, corners with nine equivalent Ni(1)Ga3Ni9 cuboctahedra, edges with nine equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with fifteen equivalent Ni(1)Ga3Ni9 cuboctahedra, faces with six equivalent Ga(1)Ga6Ni6 cuboctahedra, and faces with twelve equivalent Ni(1)Ga3Ni9 cuboctahedra. There are three shorter (2.51 Å) and six longer (2.71 Å) Ni(1)-Ni(1) bond lengths. All Ni(1)-Ga(1) bond lengths are 2.49 Å. Ga(1) is bonded to six equivalent Ni(1) and six equivalent Ga(1) atoms to form distorted GaGa6Ni6 cuboctahedra that share corners with six equivalent Ni(1)Ga3Ni9 cuboctahedra, corners with six equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with six equivalent Ga(1)Ga6Ni6 cuboctahedra, edges with eighteen equivalent Ni(1)Ga3Ni9 cuboctahedra, faces with six equivalent Ga(1)Ga6Ni6 cuboctahedra, and faces with twelve equivalent Ni(1)Ga3Ni9 cuboctahedra. All Ga(1)-Ga(1) bond lengths are 2.71 Å.