data_[Rb4Tb2Cu4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Tb  1.1000  1.7500  0.9815
  Cu  1.9000  1.3500  0.8200
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [15.1358]
_cell_length_b [4.0696]
_cell_length_c [8.2141]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.3960]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Tb(CuSe2)2]
_chemical_formula_sum '[Rb4 Tb2 Cu4 Se8]'
_cell_volume [480.1017]
_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
[
  Rb  Rb0  4  0.1321  0.0000  0.5551  1.0
  Tb  Tb1  2  0.0000  0.0000  0.0000  1.0
  Cu  Cu2  4  0.1813  0.5000  0.9867  1.0
  Se  Se3  4  0.0232  0.5000  0.7709  1.0
  Se  Se4  4  0.2015  0.0000  0.1694  1.0
]