data_global
_cell_length_a 4.037529
_cell_length_b 4.037529
_cell_length_c 4.037529
_cell_angle_alpha 90.
_cell_angle_beta 90.
_cell_angle_gamma 90.
_symmetry_space_group_name_H-M 'P -1'

loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'

  loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Al 0.0 0.0 0.0
Al 0.5 0.5 0.0
Al 0.5 0.0 0.5
Al 0.0 0.5 0.5