data_[Na8Hg2Sb2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Hg  2.0000  1.5000  1.2450
  Sb  2.0500  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [5.7917]
_cell_length_b [10.0131]
_cell_length_c [5.8335]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Na4HgSb]
_chemical_formula_sum '[Na8 Hg2 Sb2]'
_cell_volume [338.3006]
_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  0.0000  0.1606  0.0000  1.0
  Na  Na1  4  0.0000  0.3462  0.5000  1.0
  Hg  Hg2  2  0.0000  0.0000  0.5000  1.0
  Sb  Sb3  2  0.0000  0.5000  0.0000  1.0
]