data_[Ca6Ta3Pb3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Ta  1.5000  1.4500  0.8200
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.7707]
_cell_length_b [5.7707]
_cell_length_c [15.1208]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Ca2TaPbO6]
_chemical_formula_sum '[Ca6 Ta3 Pb3 O18]'
_cell_volume [436.0724]
_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  3  0.0000  0.0000  0.0242  1
  Ca  Ca1  3  0.0000  0.0000  0.5309  1
  Ta  Ta2  3  0.0000  0.0000  0.3157  1
  Pb  Pb3  3  0.0000  0.0000  0.8035  1
  O  O4  9  0.0147  0.7354  0.4081  1
  O  O5  9  0.0584  0.3518  0.9209  1
]