data_[Na6Hg4O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  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 [C2/m]
_cell_length_a [11.4173]
_cell_length_b [3.5958]
_cell_length_c [8.2826]
_cell_angle_alpha [90.0000]
_cell_angle_beta [123.4756]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3(HgO2)2]
_chemical_formula_sum '[Na6 Hg4 O8]'
_cell_volume [283.6335]
_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
[
  Na  Na0  4  0.2083  0.0000  0.8219  1.0
  Na  Na1  2  0.0000  0.0000  0.0000  1.0
  Hg  Hg2  4  0.0946  0.5000  0.3985  1.0
  O  O3  4  0.0816  0.5000  0.8723  1.0
  O  O4  4  0.2398  0.0000  0.3198  1.0
]