HoPm crystallizes in the hexagonal P-6m2 space group. Ho(1) is bonded to six equivalent Ho(1) and six equivalent Pm(1) atoms to form HoPm6Ho6 cuboctahedra that share corners with eighteen equivalent Ho(1)Pm6Ho6 cuboctahedra, edges with six equivalent Ho(1)Pm6Ho6 cuboctahedra, edges with twelve equivalent Pm(1)Pm6Ho6 cuboctahedra, faces with eight equivalent Ho(1)Pm6Ho6 cuboctahedra, and faces with twelve equivalent Pm(1)Pm6Ho6 cuboctahedra. Pm(1) is bonded to six equivalent Ho(1) and six equivalent Pm(1) atoms to form PmPm6Ho6 cuboctahedra that share corners with eighteen equivalent Pm(1)Pm6Ho6 cuboctahedra, edges with six equivalent Pm(1)Pm6Ho6 cuboctahedra, edges with twelve equivalent Ho(1)Pm6Ho6 cuboctahedra, faces with eight equivalent Pm(1)Pm6Ho6 cuboctahedra, and faces with twelve equivalent Ho(1)Pm6Ho6 cuboctahedra.
HoPm crystallizes in the hexagonal P-6m2 space group. Ho(1) is bonded to six equivalent Ho(1) and six equivalent Pm(1) atoms to form HoPm6Ho6 cuboctahedra that share corners with eighteen equivalent Ho(1)Pm6Ho6 cuboctahedra, edges with six equivalent Ho(1)Pm6Ho6 cuboctahedra, edges with twelve equivalent Pm(1)Pm6Ho6 cuboctahedra, faces with eight equivalent Ho(1)Pm6Ho6 cuboctahedra, and faces with twelve equivalent Pm(1)Pm6Ho6 cuboctahedra. All Ho(1)-Ho(1) bond lengths are 3.65 Å. All Ho(1)-Pm(1) bond lengths are 3.61 Å. Pm(1) is bonded to six equivalent Ho(1) and six equivalent Pm(1) atoms to form PmPm6Ho6 cuboctahedra that share corners with eighteen equivalent Pm(1)Pm6Ho6 cuboctahedra, edges with six equivalent Pm(1)Pm6Ho6 cuboctahedra, edges with twelve equivalent Ho(1)Pm6Ho6 cuboctahedra, faces with eight equivalent Pm(1)Pm6Ho6 cuboctahedra, and faces with twelve equivalent Ho(1)Pm6Ho6 cuboctahedra. All Pm(1)-Pm(1) bond lengths are 3.65 Å.