data_[Cu4Si2Ag2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cu  1.9000  1.3500  0.8200
  Si  1.9000  1.1000  0.5400
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [Cm]
_cell_length_a [8.6430]
_cell_length_b [2.7850]
_cell_length_c [4.7402]
_cell_angle_alpha [90.0000]
_cell_angle_beta [100.5279]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [Cu2SiAg]
_chemical_formula_sum '[Cu4 Si2 Ag2]'
_cell_volume [112.1783]
_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
[
  Si  Si0  2  0.0089  0.5000  0.5402  1
  Cu  Cu1  2  0.2460  0.0000  0.7414  1
  Cu  Cu2  2  0.4931  0.5000  0.9713  1
  Ag  Ag3  2  0.2520  0.5000  0.2471  1
]