data_[Na4Sn12Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sn  1.9600  1.4500  0.8300
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [9.7709]
_cell_length_b [7.2926]
_cell_length_c [8.7697]
_cell_angle_alpha [90.0000]
_cell_angle_beta [116.5831]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [NaSn3Hg]
_chemical_formula_sum '[Na4 Sn12 Hg4]'
_cell_volume [558.8215]
_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  0.0920  0.1952  0.5611  1.0
  Sn  Sn1  4  0.2133  0.5627  0.4315  1.0
  Sn  Sn2  4  0.3848  0.6345  0.1923  1.0
  Sn  Sn3  4  0.3956  0.2014  0.4701  1.0
  Hg  Hg4  4  0.1241  0.5588  0.7580  1.0
]