data_[K2Na2Cu2Cl8]
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
  Cu  1.9000  1.3500  0.8200
  Cl  3.1600  1.0000  0.7800
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.8916]
_cell_length_b [6.7544]
_cell_length_c [8.4612]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.0981]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KNaCuCl4]
_chemical_formula_sum '[K2 Na2 Cu2 Cl8]'
_cell_volume [376.4510]
_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  0.2638  0.7500  0.0627  1.0
  Na  Na1  2  0.2298  0.7500  0.5576  1.0
  Cu  Cu2  2  0.2273  0.2500  0.3223  1.0
  Cl  Cl3  4  0.0009  0.0034  0.2697  1.0
  Cl  Cl4  2  0.4296  0.2500  0.1483  1.0
  Cl  Cl5  2  0.4475  0.2500  0.5797  1.0
]