data_[Na8Tb8O16]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [6.6980]
_cell_length_b [13.3516]
_cell_length_c [6.0300]
_cell_angle_alpha [90.0000]
_cell_angle_beta [122.5449]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaTbO2]
_chemical_formula_sum '[Na8 Tb8 O16]'
_cell_volume [454.5759]
_cell_formula_units_Z [8]
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  4  0.0000  0.3197  0.7500  1.0
  Na  Na1  4  0.0000  0.4442  0.2500  1.0
  Tb  Tb2  4  0.0000  0.0673  0.7500  1.0
  Tb  Tb3  4  0.0000  0.1934  0.2500  1.0
  O  O4  8  0.2055  0.9365  0.7049  1.0
  O  O5  8  0.2278  0.1881  0.7063  1.0
]