data_[Pb9I18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pb  2.3300  1.8000  1.1225
  I  2.6600  1.4000  1.2733
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [4.6569]
_cell_length_b [4.6569]
_cell_length_c [67.5678]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [PbI2]
_chemical_formula_sum '[Pb9 I18]'
_cell_volume [1269.0116]
_cell_formula_units_Z [9]
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
[
  Pb  Pb0  6  0.0000  0.0000  0.4445  1.0
  Pb  Pb1  3  0.0000  0.0000  0.0000  1.0
  I  I2  6  0.0000  0.0000  0.1390  1.0
  I  I3  6  0.0000  0.0000  0.2501  1.0
  I  I4  6  0.0000  0.0000  0.3612  1.0
]