data_[Na2Tb2Si2S8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Tb  1.1000  1.7500  0.9815
  Si  1.9000  1.1000  0.5400
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.4103]
_cell_length_b [6.5780]
_cell_length_c [7.9781]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.6984]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaTbSiS4]
_chemical_formula_sum '[Na2 Tb2 Si2 S8]'
_cell_volume [323.8632]
_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
[
  Na  Na0  2  0.2544  0.2500  0.0632  1.0
  Tb  Tb1  2  0.2244  0.2500  0.5541  1.0
  Si  Si2  2  0.2361  0.7500  0.3144  1.0
  S  S3  4  0.0129  0.5004  0.2699  1.0
  S  S4  2  0.4177  0.7500  0.5804  1.0
  S  S5  2  0.4386  0.7500  0.1473  1.0
]