HoMn4Al8 crystallizes in the tetragonal I4/mmm space group. Ho(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. Mn(1) is bonded to two equivalent Ho(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing MnHo2Mn2Al8 cuboctahedra. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Ho(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ho(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms.
HoMn4Al8 crystallizes in the tetragonal I4/mmm space group. Ho(1) is bonded in a 20-coordinate geometry to eight equivalent Mn(1), four equivalent Al(1), and eight equivalent Al(2) atoms. All Ho(1)-Mn(1) bond lengths are 3.37 Å. All Ho(1)-Al(1) bond lengths are 3.01 Å. All Ho(1)-Al(2) bond lengths are 3.27 Å. Mn(1) is bonded to two equivalent Ho(1), two equivalent Mn(1), four equivalent Al(1), and four equivalent Al(2) atoms to form a mixture of distorted edge, face, and corner-sharing MnHo2Mn2Al8 cuboctahedra. Both Mn(1)-Mn(1) bond lengths are 2.60 Å. All Mn(1)-Al(1) bond lengths are 2.68 Å. All Mn(1)-Al(2) bond lengths are 2.57 Å. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 10-coordinate geometry to one Ho(1), four equivalent Mn(1), one Al(1), and four equivalent Al(2) atoms. The Al(1)-Al(1) bond length is 2.79 Å. All Al(1)-Al(2) bond lengths are 2.79 Å. In the second Al site, Al(2) is bonded in a 12-coordinate geometry to two equivalent Ho(1), four equivalent Mn(1), two equivalent Al(2), and four equivalent Al(1) atoms. Both Al(2)-Al(2) bond lengths are 2.81 Å.