data_Al
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   3.99
_cell_length_b   3.99
_cell_length_c   3.99
_cell_angle_alpha   96.75
_cell_angle_beta   96.75
_cell_angle_gamma   139.9
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Al
_chemical_formula_sum   Al2
_cell_volume   38.38
_cell_formula_units_Z   2
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  0.0  0.0  0.0  1.0
  Al  Al1  1  0.0  0.65  0.68  1.0

data_Al
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.73
_cell_length_b   3.99
_cell_length_c   3.99
_cell_angle_alpha   83.25
_cell_angle_beta   69.95
_cell_angle_gamma   69.95
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Al
_chemical_formula_sum   Al2
_cell_volume   38.38
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-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  2  0.48  0.34  0.18  1.0

Al Al
Al Al 0 1 o - - 
Al is beta Sn structured and crystallizes in the triclinic P-1 space group. The structure is zero-dimensional and consists of one dialuminium molecule. Al(1) is bonded in a distorted single-bond geometry to one Al(1) atom. The Al(1)-Al(1) bond length is 1.77 Å.