data_[K20Hg8O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Hg  2.0000  1.5000  1.2450
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [7.3947]
_cell_length_b [12.4488]
_cell_length_c [15.4955]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [K5(HgO)2]
_chemical_formula_sum '[K20 Hg8 O8]'
_cell_volume [1426.4478]
_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
[
  K  K0  16  0.2500  0.2500  0.1066  1
  K  K1  4  0.0000  0.0000  0.0000  1
  Hg  Hg2  8  0.0000  0.0000  0.2527  1
  O  O3  8  0.0000  0.2036  0.0000  1
]