Ho3In is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded to eight equivalent Ho(1) and four equivalent In(1) atoms to form distorted HoHo8In4 cuboctahedra that share corners with four equivalent In(1)Ho12 cuboctahedra, corners with fourteen equivalent Ho(1)Ho8In4 cuboctahedra, edges with six equivalent In(1)Ho12 cuboctahedra, edges with twelve equivalent Ho(1)Ho8In4 cuboctahedra, faces with four equivalent In(1)Ho12 cuboctahedra, and faces with sixteen equivalent Ho(1)Ho8In4 cuboctahedra. In(1) is bonded to twelve equivalent Ho(1) atoms to form InHo12 cuboctahedra that share corners with six equivalent In(1)Ho12 cuboctahedra, corners with twelve equivalent Ho(1)Ho8In4 cuboctahedra, edges with eighteen equivalent Ho(1)Ho8In4 cuboctahedra, faces with eight equivalent In(1)Ho12 cuboctahedra, and faces with twelve equivalent Ho(1)Ho8In4 cuboctahedra.
Ho3In is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Ho(1) is bonded to eight equivalent Ho(1) and four equivalent In(1) atoms to form distorted HoHo8In4 cuboctahedra that share corners with four equivalent In(1)Ho12 cuboctahedra, corners with fourteen equivalent Ho(1)Ho8In4 cuboctahedra, edges with six equivalent In(1)Ho12 cuboctahedra, edges with twelve equivalent Ho(1)Ho8In4 cuboctahedra, faces with four equivalent In(1)Ho12 cuboctahedra, and faces with sixteen equivalent Ho(1)Ho8In4 cuboctahedra. There are a spread of Ho(1)-Ho(1) bond distances ranging from 3.30-3.49 Å. There are two shorter (3.39 Å) and two longer (3.40 Å) Ho(1)-In(1) bond lengths. In(1) is bonded to twelve equivalent Ho(1) atoms to form InHo12 cuboctahedra that share corners with six equivalent In(1)Ho12 cuboctahedra, corners with twelve equivalent Ho(1)Ho8In4 cuboctahedra, edges with eighteen equivalent Ho(1)Ho8In4 cuboctahedra, faces with eight equivalent In(1)Ho12 cuboctahedra, and faces with twelve equivalent Ho(1)Ho8In4 cuboctahedra.