data_[K4Pm2Hg4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  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 [C2/m]
_cell_length_a [12.9125]
_cell_length_b [3.5718]
_cell_length_c [9.1776]
_cell_angle_alpha [90.0000]
_cell_angle_beta [122.7775]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K2Pm(HgO2)2]
_chemical_formula_sum '[K4 Pm2 Hg4 O8]'
_cell_volume [355.8799]
_cell_formula_units_Z [2]
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
[
  K  K0  4  0.1558  0.5000  0.7824  1
  Pm  Pm1  2  0.0000  0.0000  0.0000  1
  Hg  Hg2  4  0.1595  0.5000  0.3754  1
  O  O3  4  0.0244  0.0000  0.2804  1
  O  O4  4  0.1454  0.5000  0.0989  1
]