data_[Ag20Se4Cl8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.7151]
_cell_length_b [15.4254]
_cell_length_c [13.2599]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Ag5SeCl2]
_chemical_formula_sum '[Ag20 Se4 Cl8]'
_cell_volume [759.8795]
_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
[
  Ag  Ag0  8  0.0000  0.1118  0.0772  1
  Ag  Ag1  8  0.0000  0.2964  0.0622  1
  Ag  Ag2  4  0.0000  0.1857  0.7500  1
  Se  Se3  4  0.0000  0.1922  0.2500  1
  Cl  Cl4  8  0.0000  0.0599  0.6109  1
]