data_[Na16Hg4Pb4]
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 [Imma]
_cell_length_a [5.5287]
_cell_length_b [22.3146]
_cell_length_c [5.6931]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Na4HgPb]
_chemical_formula_sum '[Na16 Hg4 Pb4]'
_cell_volume [702.3664]
_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  8  0.0000  0.0768  0.9826  1.0
  Na  Na1  8  0.0000  0.1686  0.4639  1.0
  Hg  Hg2  4  0.0000  0.0000  0.5000  1.0
  Pb  Pb3  4  0.0000  0.2500  0.9440  1.0
]