data_[Na4Zn4Cr2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Zn  1.6500  1.3500  0.8800
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.8989]
_cell_length_b [3.8602]
_cell_length_c [7.3170]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.2511]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Zn2CrSe4]
_chemical_formula_sum '[Na4 Zn4 Cr2 Se8]'
_cell_volume [415.6330]
_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
[
  Na  Na0  4  0.1249  0.0000  0.5202  1.0
  Zn  Zn1  4  0.1713  0.5000  0.9897  1.0
  Cr  Cr2  2  0.0000  0.0000  0.0000  1.0
  Se  Se3  4  0.0109  0.5000  0.7718  1.0
  Se  Se4  4  0.2273  0.0000  0.2190  1.0
]