data_[Na8Si8Sn8]
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
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Fmmm]
_cell_length_a [6.2275]
_cell_length_b [8.6926]
_cell_length_c [12.6223]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [69]
_chemical_formula_structural [NaSiSn]
_chemical_formula_sum '[Na8 Si8 Sn8]'
_cell_volume [683.2847]
_cell_formula_units_Z [8]
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  0.3313  1
  Si  Si1  8  0.0000  0.0000  0.0928  1
  Sn  Sn2  8  0.2500  0.2500  0.0000  1
]