data_[Na4Se8I4F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Se  2.5500  1.1500  1.0133
  I  2.6600  1.4000  1.2733
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [7.0598]
_cell_length_b [9.8055]
_cell_length_c [7.3840]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [NaSe2IF2]
_chemical_formula_sum '[Na4 Se8 I4 F8]'
_cell_volume [511.1536]
_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
[
  Na  Na0  4  0.0000  0.5000  0.0000  1
  Se  Se1  8  0.0000  0.2036  0.0147  1
  I  I2  4  0.0000  0.0510  0.7500  1
  F  F3  8  0.1923  0.4777  0.2500  1
]