data_[Na16Ag4Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ag  1.9300  1.6000  1.0867
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [9.1498]
_cell_length_b [14.0826]
_cell_length_c [5.6468]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.4446]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [Na4AgHg]
_chemical_formula_sum '[Na16 Ag4 Hg4]'
_cell_volume [686.1028]
_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  0.1196  0.1819  0.0731  1.0
  Na  Na1  8  0.1977  0.4243  0.3457  1.0
  Ag  Ag2  4  0.0000  0.0010  0.7500  1.0
  Hg  Hg3  4  0.0000  0.3728  0.7500  1.0
]