data_[Na4Hg14Pb4]
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 [Imm2]
_cell_length_a [3.6641]
_cell_length_b [16.4254]
_cell_length_c [10.4920]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [44]
_chemical_formula_structural [Na2Hg7Pb2]
_chemical_formula_sum '[Na4 Hg14 Pb4]'
_cell_volume [631.4486]
_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  0.1981  0.5956  1.0
  Hg  Hg1  4  0.0000  0.1252  0.0890  1.0
  Hg  Hg2  4  0.0000  0.3173  0.8449  1.0
  Hg  Hg3  4  0.0000  0.3386  0.3437  1.0
  Hg  Hg4  2  0.0000  0.0000  0.5234  1.0
  Pb  Pb5  2  0.0000  0.0000  0.8173  1.0
  Pb  Pb6  2  0.0000  0.5000  0.7666  1.0
]