data_[Na8Hg4Pb8]
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
  Pb  2.3300  1.8000  1.1225
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.5415]
_cell_length_b [5.1530]
_cell_length_c [11.5157]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.7521]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2HgPb2]
_chemical_formula_sum '[Na8 Hg4 Pb8]'
_cell_volume [602.0446]
_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
[
  Na  Na0  4  0.0198  0.5000  0.1510  1.0
  Na  Na1  4  0.1089  0.0000  0.6759  1.0
  Hg  Hg2  4  0.1856  0.0000  0.2822  1.0
  Pb  Pb3  4  0.1360  0.5000  0.4535  1.0
  Pb  Pb4  4  0.1647  0.0000  0.0107  1.0
]