data_Cu2Ag
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   8.5
_cell_length_b   8.5
_cell_length_c   8.5
_cell_angle_alpha   161.69
_cell_angle_beta   151.87
_cell_angle_gamma   33.77
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Cu2Ag
_chemical_formula_sum   'Cu4 Ag2'
_cell_volume   90.91
_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  0.0  0.03  0.62  1.0
  Cu  Cu3  1  0.0  0.03  0.06  1.0
  Cu  Cu4  1  0.35  0.03  0.07  1.0
  Cu  Cu5  1  0.35  0.03  0.52  1.0
  Ag  Ag0  1  0.0  0.03  0.03  1.0
  Ag  Ag1  1  0.35  0.03  0.11  1.0

data_Cu2Ag
_symmetry_space_group_name_H-M   P-1
_cell_length_a   2.7
_cell_length_b   4.13
_cell_length_c   8.5
_cell_angle_alpha   104.06
_cell_angle_beta   99.15
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   2
_chemical_formula_structural   Cu2Ag
_chemical_formula_sum   'Cu4 Ag2'
_cell_volume   90.91
_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  0.17  0.49  0.17  1.0
  Cu  Cu1  2  0.27  0.95  0.27  1.0
  Ag  Ag2  2  0.14  0.46  0.14  1.0

Cu Cu Cu Cu Ag Ag