data_[Na2Sn4Hg2]
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/m]
_cell_length_a [4.5830]
_cell_length_b [8.7809]
_cell_length_c [5.8610]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.4985]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [NaSn2Hg]
_chemical_formula_sum '[Na2 Sn4 Hg2]'
_cell_volume [223.6758]
_cell_formula_units_Z [2]
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  0.0644  0.7500  0.1267  1.0
  Sn  Sn1  4  0.3557  0.5465  0.7287  1.0
  Hg  Hg2  2  0.2213  0.2500  0.4522  1.0
]