data_[Na12Ag4Hg4]
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/m]
_cell_length_a [15.9622]
_cell_length_b [4.2411]
_cell_length_c [8.7485]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.3190]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3AgHg]
_chemical_formula_sum '[Na12 Ag4 Hg4]'
_cell_volume [592.2453]
_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  4  0.0549  0.0000  0.2061  1.0
  Na  Na1  4  0.0980  0.5000  0.5773  1.0
  Na  Na2  4  0.2419  0.0000  0.8179  1.0
  Ag  Ag3  4  0.2069  0.0000  0.4277  1.0
  Hg  Hg4  4  0.0911  0.5000  0.9378  1.0
]