data_[Na8Si16Au20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Si  1.9000  1.1000  0.5400
  Au  2.5400  1.3500  1.0700
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [6.2210]
_cell_length_b [12.2215]
_cell_length_c [12.8947]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [Na2Si4Au5]
_chemical_formula_sum '[Na8 Si16 Au20]'
_cell_volume [980.3844]
_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  8  0.0000  0.0000  0.1514  1
  Si  Si1  16  0.0000  0.1525  0.3741  1
  Au  Au2  8  0.2500  0.2500  0.0000  1
  Au  Au3  8  0.2500  0.2500  0.2500  1
  Au  Au4  4  0.0000  0.0000  0.5000  1
]