Al crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Al(1) and four equivalent Al(2) atoms to form a mixture of distorted corner, face, and edge-sharing AlAl8 hexagonal bipyramids. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one Al(2) and four equivalent Al(1) atoms.
Al crystallizes in the tetragonal I4/mmm space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to four equivalent Al(1) and four equivalent Al(2) atoms to form a mixture of distorted corner, face, and edge-sharing AlAl8 hexagonal bipyramids. All Al(1)-Al(1) bond lengths are 2.77 Å. All Al(1)-Al(2) bond lengths are 2.66 Å. In the second Al site, Al(2) is bonded in a 5-coordinate geometry to one Al(2) and four equivalent Al(1) atoms. The Al(2)-Al(2) bond length is 2.52 Å.