data_[Na8Sn4O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_12_12_1]
_cell_length_a [5.2508]
_cell_length_b [6.6958]
_cell_length_c [9.7485]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [19]
_chemical_formula_structural [Na2SnO2]
_chemical_formula_sum '[Na8 Sn4 O8]'
_cell_volume [342.7358]
_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  0.0082  0.1231  0.0768  1.0
  Na  Na1  4  0.0104  0.1310  0.7587  1.0
  Sn  Sn2  4  0.0173  0.6018  0.0711  1.0
  O  O3  4  0.0015  0.8925  0.5802  1.0
  O  O4  4  0.0851  0.3420  0.5564  1.0
]