data_[Rb4Na4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [9.4214]
_cell_length_b [4.4852]
_cell_length_c [12.0347]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [RbNaSe2]
_chemical_formula_sum '[Rb4 Na4 Se8]'
_cell_volume [508.5502]
_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
[
  Rb  Rb0  4  0.1341  0.2500  0.1345  1
  Na  Na1  4  0.1416  0.2500  0.4048  1
  Se  Se2  4  0.0698  0.2500  0.6412  1
  Se  Se3  4  0.1550  0.2500  0.8317  1
]