data_[Na4Sn2Hg2Br8]
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
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [14.1760]
_cell_length_b [4.3928]
_cell_length_c [8.8351]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.1635]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2SnHgBr4]
_chemical_formula_sum '[Na4 Sn2 Hg2 Br8]'
_cell_volume [519.6892]
_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  4  0.2223  0.0000  0.7219  1.0
  Sn  Sn1  2  0.0000  0.0000  0.0000  1.0
  Hg  Hg2  2  0.0000  0.5000  0.5000  1.0
  Br  Br3  4  0.1275  0.5000  0.9246  1.0
  Br  Br4  4  0.1569  0.0000  0.3243  1.0
]