data_CuAg
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.35
_cell_length_b   5.35
_cell_length_c   3.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   CuAg
_chemical_formula_sum   'Cu4 Ag4'
_cell_volume   108.02
_cell_formula_units_Z   4
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  Cu4  1  0.0  0.01  0.89  1.0
  Cu  Cu5  1  0.34  0.0  0.0  1.0
  Cu  Cu6  1  0.01  0.0  0.0  1.0
  Cu  Cu7  1  0.0  0.34  0.89  1.0
  Ag  Ag0  1  0.67  0.34  0.89  1.0
  Ag  Ag1  1  0.01  0.67  0.0  1.0
  Ag  Ag2  1  0.67  0.01  0.89  1.0
  Ag  Ag3  1  0.34  0.67  0.0  1.0

data_CuAg
_symmetry_space_group_name_H-M   C2
_cell_length_a   7.56
_cell_length_b   7.56
_cell_length_c   3.78
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   5
_chemical_formula_structural   CuAg
_chemical_formula_sum   'Cu8 Ag8'
_cell_volume   216.04
_cell_formula_units_Z   8
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
  Cu  Cu0  4  0.0  0.0  0.56  1.0
  Cu  Cu1  4  0.17  0.17  0.56  1.0
  Ag  Ag2  4  0.17  0.5  0.44  1.0
  Ag  Ag3  4  0.17  0.84  0.56  1.0

Cu Cu Cu Cu Ag Ag Ag Ag