data_[Pm18Co12O54]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Co  1.8800  1.3500  0.7683
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3c]
_cell_length_a [9.1047]
_cell_length_b [9.1047]
_cell_length_c [12.7972]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [167]
_chemical_formula_structural [Pm3Co2O9]
_chemical_formula_sum '[Pm18 Co12 O54]'
_cell_volume [918.6975]
_cell_formula_units_Z [6]
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
[
  Pm  Pm0  18  0.0000  0.3384  0.2500  1
  Co  Co1  12  0.0000  0.0000  0.1522  1
  O  O2  36  0.0025  0.1751  0.4140  1
  O  O3  18  0.0000  0.1621  0.7500  1
]