The crystal structure described by 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. is represented by the CIF file [CIF]
data_Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.918
_cell_length_b   3.918
_cell_length_c   6.723
_cell_angle_alpha   106.940
_cell_angle_beta   106.940
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   94.042
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Al  Al0  1  0.250  0.750  0.500  1.0
  Al  Al1  1  0.750  0.250  0.500  1.0
  Al  Al2  1  0.603  0.603  0.206  1.0
  Al  Al3  1  0.397  0.397  0.794  1.0
[/CIF]
.
The crystal structure described by 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. is represented by the CIF file [CIF]
data_Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.918
_cell_length_b   3.918
_cell_length_c   6.723
_cell_angle_alpha   106.940
_cell_angle_beta   106.940
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   94.042
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Al  Al0  1  0.250  0.750  0.500  1.0
  Al  Al1  1  0.750  0.250  0.500  1.0
  Al  Al2  1  0.603  0.603  0.206  1.0
  Al  Al3  1  0.397  0.397  0.794  1.0
[/CIF]
.