data_[Na4Hg4I2O12]
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
  I  2.6600  1.4000  1.2733
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.9941]
_cell_length_b [10.3128]
_cell_length_c [6.0123]
_cell_angle_alpha [90.0000]
_cell_angle_beta [94.9844]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Hg2IO6]
_chemical_formula_sum '[Na4 Hg4 I2 O12]'
_cell_volume [370.2545]
_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  0.0000  0.3404  0.5000  1.0
  Hg  Hg1  4  0.0000  0.1577  0.0000  1.0
  I  I2  2  0.0000  0.0000  0.5000  1.0
  O  O3  8  0.1462  0.1431  0.6958  1.0
  O  O4  4  0.2493  0.5000  0.6758  1.0
]