data_[K12Na4Hg2O2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Hg  2.0000  1.5000  1.2450
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [8.6939]
_cell_length_b [8.8106]
_cell_length_c [12.3717]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [K6Na2HgO]
_chemical_formula_sum '[K12 Na4 Hg2 O2]'
_cell_volume [947.6584]
_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  8  0.2156  0.2135  0.0000  1
  K  K1  4  0.0000  0.0000  0.2145  1
  Na  Na2  4  0.0000  0.5000  0.2471  1
  Hg  Hg3  2  0.0000  0.0000  0.5000  1
  O  O4  2  0.0000  0.0000  0.0000  1
]