data_[Na3Sn4Hg2]
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 [P-1]
_cell_length_a [5.1820]
_cell_length_b [6.3125]
_cell_length_c [8.2298]
_cell_angle_alpha [75.4161]
_cell_angle_beta [88.0187]
_cell_angle_gamma [66.9039]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Na3(Sn2Hg)2]
_chemical_formula_sum '[Na3 Sn4 Hg2]'
_cell_volume [239.0328]
_cell_formula_units_Z [1]
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  2  0.1259  0.7386  0.6635  1.0
  Na  Na1  1  0.0000  0.0000  0.0000  1.0
  Sn  Sn2  2  0.3318  0.3395  0.0419  1.0
  Sn  Sn3  2  0.4288  0.1227  0.6545  1.0
  Hg  Hg4  2  0.2126  0.5919  0.3301  1.0
]