data_[K4Cu2Ag2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Cu  1.9000  1.3500  0.8200
  Ag  1.9300  1.6000  1.0867
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [4.8418]
_cell_length_b [5.0309]
_cell_length_c [11.6359]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [K2CuAg]
_chemical_formula_sum '[K4 Cu2 Ag2]'
_cell_volume [283.4350]
_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
[
  K  K0  2  0.0000  0.0000  0.0993  1
  K  K1  2  0.5000  0.0000  0.3971  1
  Cu  Cu2  2  0.5000  0.0000  0.7120  1
  Ag  Ag3  2  0.0000  0.0000  0.7889  1
]