data_[Na8Sn4As4]
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
  As  2.1800  1.1500  0.6600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [7.3213]
_cell_length_b [6.2177]
_cell_length_c [10.8792]
_cell_angle_alpha [90.0000]
_cell_angle_beta [119.8272]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na2SnAs]
_chemical_formula_sum '[Na8 Sn4 As4]'
_cell_volume [429.6281]
_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  0.1834  0.0896  0.8390  1.0
  Na  Na1  4  0.1849  0.6980  0.0503  1.0
  Sn  Sn2  4  0.3847  0.6044  0.8517  1.0
  As  As3  4  0.2760  0.1933  0.1343  1.0
]