data_[Cu2Ag4As2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cu  1.9000  1.3500  0.8200
  Ag  1.9300  1.6000  1.0867
  As  2.1800  1.1500  0.6600
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I-4]
_cell_length_a [6.0161]
_cell_length_b [6.0161]
_cell_length_c [11.1566]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [82]
_chemical_formula_structural [CuAg2AsSe4]
_chemical_formula_sum '[Cu2 Ag4 As2 Se8]'
_cell_volume [403.7933]
_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  Cu0  2  0.0000  0.0000  0.0000  1.0
  Ag  Ag1  2  0.0000  0.0000  0.5000  1.0
  Ag  Ag2  2  0.0000  0.5000  0.7500  1.0
  As  As3  2  0.0000  0.5000  0.2500  1.0
  Se  Se4  8  0.2151  0.7493  0.1225  1.0
]