data_[Rb4Tl4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tl  1.6200  1.9000  1.3325
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Pna2_1]
_cell_length_a [9.5394]
_cell_length_b [9.3674]
_cell_length_c [7.6077]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [33]
_chemical_formula_structural [RbTlSe2]
_chemical_formula_sum '[Rb4 Tl4 Se8]'
_cell_volume [679.8188]
_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  0.1252  0.6482  0.5711  1.0
  Tl  Tl1  4  0.0723  0.2013  0.4995  1.0
  Se  Se2  4  0.1974  0.8480  0.2121  1.0
  Se  Se3  4  0.2111  0.4736  0.9672  1.0
]