data_[Cs2Na2Se2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Cs  0.7900  2.6000  1.8100
  Na  0.9300  1.8000  1.1600
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P6_3]
_cell_length_a [5.6129]
_cell_length_b [5.6129]
_cell_length_c [9.6355]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [173]
_chemical_formula_structural [CsNaSeO4]
_chemical_formula_sum '[Cs2 Na2 Se2 O8]'
_cell_volume [262.8898]
_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
[
  Cs  Cs0  2  0.0000  0.0000  0.0195  1
  Na  Na1  2  0.3333  0.6667  0.7207  1
  Se  Se2  2  0.3333  0.6667  0.3197  1
  O  O3  6  0.0754  0.3665  0.2641  1
  O  O4  2  0.3333  0.6667  0.4929  1
]