data_[K4Na4Ce2Se8]
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
  Ce  1.1200  1.8500  1.0800
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.4698]
_cell_length_b [4.4854]
_cell_length_c [10.9394]
_cell_angle_alpha [90.0000]
_cell_angle_beta [126.9589]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K2Na2CeSe4]
_chemical_formula_sum '[K4 Na4 Ce2 Se8]'
_cell_volume [606.5408]
_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  4  0.1794  0.0000  0.7977  1
  Na  Na1  4  0.1497  0.5000  0.3795  1
  Ce  Ce2  2  0.0000  0.0000  0.0000  1
  Se  Se3  4  0.0662  0.5000  0.8972  1
  Se  Se4  4  0.2118  0.0000  0.2860  1
]