data_[Ca6Tb3Bi3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Tb  1.1000  1.7500  0.9815
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3]
_cell_length_a [5.9249]
_cell_length_b [5.9249]
_cell_length_c [14.7670]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [148]
_chemical_formula_structural [Ca2TbBiO6]
_chemical_formula_sum '[Ca6 Tb3 Bi3 O18]'
_cell_volume [448.9325]
_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
[
  Ca  Ca0  6  0.0000  0.0000  0.2803  1.0
  Tb  Tb1  3  0.0000  0.0000  0.0000  1.0
  Bi  Bi2  3  -0.0000  0.0000  0.5000  1.0
  O  O3  18  0.0278  0.6258  0.2554  1.0
]