data_[Na3Hg6Bi3]
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 [R3m]
_cell_length_a [3.5585]
_cell_length_b [3.5585]
_cell_length_c [31.3273]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [160]
_chemical_formula_structural [NaHg2Bi]
_chemical_formula_sum '[Na3 Hg6 Bi3]'
_cell_volume [343.5423]
_cell_formula_units_Z [3]
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  3  0.0000  0.0000  0.3335  1.0
  Hg  Hg1  3  0.0000  0.0000  0.7440  1.0
  Hg  Hg2  3  0.0000  0.0000  0.9226  1.0
  Bi  Bi3  3  0.0000  0.0000  0.4999  1.0
]