data_[Na3Al3Pb6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Al  1.6100  1.2500  0.6750
  Pb  2.3300  1.8000  1.1225
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.4781]
_cell_length_b [5.4781]
_cell_length_c [14.7072]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaAl(PbO3)2]
_chemical_formula_sum '[Na3 Al3 Pb6 O18]'
_cell_volume [382.2321]
_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  0.8038  1.0
  Al  Al1  3  0.0000  0.0000  0.3216  1.0
  Pb  Pb2  3  0.0000  0.0000  0.0197  1.0
  Pb  Pb3  3  0.0000  0.0000  0.5273  1.0
  O  O4  9  0.0396  0.3481  0.9217  1.0
  O  O5  9  0.0666  0.6758  0.0746  1.0
]