data_[K2Na2Zn2Se4]
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
  Zn  1.6500  1.3500  0.8800
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Pmma]
_cell_length_a [5.4501]
_cell_length_b [7.8248]
_cell_length_c [6.4258]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [51]
_chemical_formula_structural [KNaZnSe2]
_chemical_formula_sum '[K2 Na2 Zn2 Se4]'
_cell_volume [274.0351]
_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  0.2500  0.5000  0.2179  1
  Na  Na1  2  0.2500  0.0000  0.4272  1
  Zn  Zn2  2  0.0000  0.0000  0.0000  1
  Se  Se3  4  0.2500  0.2262  0.7897  1
]