data_[Na4Si2Sn2O8]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmn2_1]
_cell_length_a [7.6213]
_cell_length_b [5.9246]
_cell_length_c [5.1567]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Na2SiSnO4]
_chemical_formula_sum '[Na4 Si2 Sn2 O8]'
_cell_volume [232.8436]
_cell_formula_units_Z [2]
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  0.2384  0.3197  0.4767  1.0
  Si  Si1  2  0.0000  0.1497  0.0047  1.0
  Sn  Sn2  2  0.0000  0.7743  0.4773  1.0
  O  O3  4  0.1808  0.2876  0.9351  1.0
  O  O4  2  0.0000  0.1013  0.3266  1.0
  O  O5  2  0.0000  0.8924  0.8677  1.0
]