data_[Pm20Hg8O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Hg  2.0000  1.5000  1.2450
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [8.9291]
_cell_length_b [6.8487]
_cell_length_c [14.1210]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [Pm5Hg2O]
_chemical_formula_sum '[Pm20 Hg8 O4]'
_cell_volume [863.5466]
_cell_formula_units_Z [4]
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  8  0.1337  0.0002  0.3985  1
  Pm  Pm1  4  0.0000  0.0000  0.0000  1
  Pm  Pm2  4  0.0596  0.2500  0.7892  1
  Pm  Pm3  4  0.2320  0.7500  0.6242  1
  Hg  Hg4  4  0.0622  0.7500  0.8094  1
  Hg  Hg5  4  0.2119  0.2500  0.5902  1
  O  O6  4  0.1866  0.2500  0.9515  1
]