data_AlCu2Si
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   2.77
_cell_length_b   2.77
_cell_length_c   8.09
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   120.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   AlCu2Si
_chemical_formula_sum   'Al1 Cu2 Si1'
_cell_volume   53.94
_cell_formula_units_Z   1
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
  Cu  Cu1  1  0.39  0.8  0.05  1.0
  Cu  Cu2  1  0.39  0.8  0.04  1.0
  Si  Si3  1  0.0  0.0  0.04  1.0

data_AlCu2Si
_symmetry_space_group_name_H-M   Cm
_cell_length_a   4.81
_cell_length_b   2.77
_cell_length_c   8.09
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   AlCu2Si
_chemical_formula_sum   'Al2 Cu4 Si2'
_cell_volume   107.89
_cell_formula_units_Z   2
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  0.0  0.0  0.0  1.0
  Si  Si1  2  0.0  0.0  0.04  1.0
  Cu  Cu2  2  0.4  0.0  0.04  1.0
  Cu  Cu3  2  0.4  0.0  0.05  1.0

Al Cu Cu Si
Al Cu Cu Si 0 3 o o o 1 2 o o o 