data_[Na20Hg8Bi8]
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
  Bi  2.0200  1.6000  1.0350
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [7.2818]
_cell_length_b [9.5864]
_cell_length_c [15.5740]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [Na5(HgBi)2]
_chemical_formula_sum '[Na20 Hg8 Bi8]'
_cell_volume [1087.1609]
_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  16  0.2500  0.2500  0.1522  1.0
  Na  Na1  4  0.0000  0.0000  0.0000  1.0
  Hg  Hg2  8  0.0000  0.1526  0.5000  1.0
  Bi  Bi3  8  0.0000  0.0000  0.2425  1.0
]