data_[Na8Hg8As4]
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
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.0659]
_cell_length_b [4.4907]
_cell_length_c [11.5420]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.6111]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Hg2As]
_chemical_formula_sum '[Na8 Hg8 As4]'
_cell_volume [529.4709]
_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  0.0159  0.0000  0.3436  1.0
  Na  Na1  4  0.1931  0.0000  0.1229  1.0
  Hg  Hg2  4  0.0354  0.5000  0.8868  1.0
  Hg  Hg3  4  0.1451  0.5000  0.5537  1.0
  As  As4  4  0.2185  0.5000  0.3215  1.0
]