data_Cu2Ag
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.93
_cell_length_b   6.93
_cell_length_c   4.28
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   158.21
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2Ag
_chemical_formula_sum   'Cu4 Ag2'
_cell_volume   76.3
_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
  Cu  Cu2  1  0.31  0.49  0.07  1.0
  Cu  Cu3  1  0.31  0.95  0.07  1.0
  Cu  Cu4  1  0.31  0.05  0.21  1.0
  Cu  Cu5  1  0.31  0.51  0.21  1.0
  Ag  Ag0  1  0.31  0.03  0.07  1.0
  Ag  Ag1  1  0.31  0.97  0.21  1.0

data_Cu2Ag
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.62
_cell_length_b   4.28
_cell_length_c   6.93
_cell_angle_alpha   90.0
_cell_angle_beta   100.89
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Cu2Ag
_chemical_formula_sum   'Cu4 Ag2'
_cell_volume   76.3
_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
  Cu  Cu0  2  0.05  0.43  0.55  1.0
  Cu  Cu1  2  0.49  0.57  0.99  1.0
  Ag  Ag2  2  0.03  0.57  0.53  1.0

Cu Cu Cu Cu Ag Ag