data_[Na3Tb6Ir3O18]
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
  Ir  2.2000  1.3500  0.7650
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.6436]
_cell_length_b [5.6436]
_cell_length_c [15.0225]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaTb2IrO6]
_chemical_formula_sum '[Na3 Tb6 Ir3 O18]'
_cell_volume [414.3667]
_cell_formula_units_Z [3]
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  3  0.0000  0.0000  0.1971  1.0
  Tb  Tb1  3  0.0000  0.0000  0.4718  1.0
  Tb  Tb2  3  0.0000  0.0000  0.9812  1.0
  Ir  Ir3  3  0.0000  0.0000  0.6758  1.0
  O  O4  9  0.0157  0.3780  0.4129  1.0
  O  O5  9  0.0589  0.6667  0.2580  1.0
]