data_[Rb4Tb2Al2S8]
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
  Al  1.6100  1.2500  0.6750
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [I-4]
_cell_length_a [7.2547]
_cell_length_b [7.2547]
_cell_length_c [9.8123]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [82]
_chemical_formula_structural [Rb2TbAlS4]
_chemical_formula_sum '[Rb4 Tb2 Al2 S8]'
_cell_volume [516.4339]
_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  2  0.0000  0.0000  0.0000  1
  Rb  Rb1  2  0.0000  0.5000  0.7500  1
  Tb  Tb2  2  0.0000  0.5000  0.2500  1
  Al  Al3  2  0.0000  0.0000  0.5000  1
  S  S4  8  0.1488  0.7754  0.3811  1
]