data_[Cs2Na6Se4]
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
]
_symmetry_space_group_name_H-M [Pmc2_1]
_cell_length_a [21.7781]
_cell_length_b [9.5163]
_cell_length_c [8.8067]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [26]
_chemical_formula_structural [CsNa3Se2]
_chemical_formula_sum '[Cs2 Na6 Se4]'
_cell_volume [1825.1533]
_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  0.5000  0.3571  0.6107  1
  Na  Na1  4  0.3444  0.4648  0.0047  1
  Na  Na2  2  0.5000  0.2535  0.1943  1
  Se  Se3  4  0.3930  0.3790  0.2744  1
]