data_[K1Na1Tb2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Tb  1.1000  1.7500  0.9815
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [Pmmm]
_cell_length_a [3.8907]
_cell_length_b [5.9336]
_cell_length_c [7.7580]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [47]
_chemical_formula_structural [KNaTb2F8]
_chemical_formula_sum '[K1 Na1 Tb2 F8]'
_cell_volume [179.0994]
_cell_formula_units_Z [1]
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  1  0.0000  0.0000  0.5000  1.0
  Na  Na1  1  0.0000  0.0000  0.0000  1.0
  Tb  Tb2  2  0.5000  0.5000  0.2458  1.0
  F  F3  4  0.0000  0.2850  0.2402  1.0
  F  F4  2  0.5000  0.2772  0.0000  1.0
  F  F5  2  0.5000  0.2911  0.5000  1.0
]