data_[K20Na8Ag4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [4.8543]
_cell_length_b [13.8977]
_cell_length_c [24.9309]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [K5Na2Ag]
_chemical_formula_sum '[K20 Na8 Ag4]'
_cell_volume [1681.9230]
_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
[
  K  K0  8  0.0000  0.0853  0.1183  1
  K  K1  8  0.0000  0.3605  0.0445  1
  K  K2  4  0.0000  0.4910  0.2500  1
  Na  Na3  8  0.0000  0.2207  0.6813  1
  Ag  Ag4  4  0.0000  0.2014  0.2500  1
]