MgHo3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve equivalent Ho(1) atoms to form MgHo12 cuboctahedra that share corners with six equivalent Mg(1)Ho12 cuboctahedra, corners with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra, edges with eighteen equivalent Ho(1)Ho8Mg4 cuboctahedra, faces with eight equivalent Mg(1)Ho12 cuboctahedra, and faces with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra. Ho(1) is bonded to four equivalent Mg(1) and eight equivalent Ho(1) atoms to form HoHo8Mg4 cuboctahedra that share corners with four equivalent Mg(1)Ho12 cuboctahedra, corners with fourteen equivalent Ho(1)Ho8Mg4 cuboctahedra, edges with six equivalent Mg(1)Ho12 cuboctahedra, edges with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra, faces with four equivalent Mg(1)Ho12 cuboctahedra, and faces with sixteen equivalent Ho(1)Ho8Mg4 cuboctahedra.
MgHo3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve equivalent Ho(1) atoms to form MgHo12 cuboctahedra that share corners with six equivalent Mg(1)Ho12 cuboctahedra, corners with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra, edges with eighteen equivalent Ho(1)Ho8Mg4 cuboctahedra, faces with eight equivalent Mg(1)Ho12 cuboctahedra, and faces with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra. There are six shorter (3.39 Å) and six longer (3.49 Å) Mg(1)-Ho(1) bond lengths. Ho(1) is bonded to four equivalent Mg(1) and eight equivalent Ho(1) atoms to form HoHo8Mg4 cuboctahedra that share corners with four equivalent Mg(1)Ho12 cuboctahedra, corners with fourteen equivalent Ho(1)Ho8Mg4 cuboctahedra, edges with six equivalent Mg(1)Ho12 cuboctahedra, edges with twelve equivalent Ho(1)Ho8Mg4 cuboctahedra, faces with four equivalent Mg(1)Ho12 cuboctahedra, and faces with sixteen equivalent Ho(1)Ho8Mg4 cuboctahedra. There are a spread of Ho(1)-Ho(1) bond distances ranging from 3.41-3.56 Å.