HoGa6 crystallizes in the tetragonal P4/nbm space group. Ho(1) is bonded to four equivalent Ga(2) and eight equivalent Ga(1) atoms to form a mixture of face and edge-sharing HoGa12 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ga(1), and four equivalent Ga(2) atoms. In the second Ga site, Ga(2) is bonded in a 4-coordinate geometry to one Ho(1), one Ga(2), and two equivalent Ga(1) atoms.
HoGa6 crystallizes in the tetragonal P4/nbm space group. Ho(1) is bonded to four equivalent Ga(2) and eight equivalent Ga(1) atoms to form a mixture of face and edge-sharing HoGa12 cuboctahedra. All Ho(1)-Ga(2) bond lengths are 3.04 Å. All Ho(1)-Ga(1) bond lengths are 3.19 Å. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded in a 9-coordinate geometry to four equivalent Ho(1), one Ga(1), and four equivalent Ga(2) atoms. The Ga(1)-Ga(1) bond length is 2.41 Å. All Ga(1)-Ga(2) bond lengths are 2.58 Å. In the second Ga site, Ga(2) is bonded in a 4-coordinate geometry to one Ho(1), one Ga(2), and two equivalent Ga(1) atoms. The Ga(2)-Ga(2) bond length is 2.51 Å.