data_[K2Tb2Si2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Tb  1.1000  1.7500  0.9815
  Si  1.9000  1.1000  0.5400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.7078]
_cell_length_b [6.9719]
_cell_length_c [9.1184]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.5857]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KTbSiSe4]
_chemical_formula_sum '[K2 Tb2 Si2 Se8]'
_cell_volume [406.5091]
_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
[
  K  K0  2  0.2543  0.2500  0.0611  1.0
  Tb  Tb1  2  0.2283  0.2500  0.5515  1.0
  Si  Si2  2  0.2232  0.7500  0.3276  1.0
  Se  Se3  4  0.0057  0.5042  0.7131  1.0
  Se  Se4  2  0.4212  0.7500  0.1657  1.0
  Se  Se5  2  0.4252  0.7500  0.5777  1.0
]