data_[Na2Sn2Se4O16]
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
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [8.7897]
_cell_length_b [5.7764]
_cell_length_c [7.4585]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.1362]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [NaSn(SeO4)2]
_chemical_formula_sum '[Na2 Sn2 Se4 O16]'
_cell_volume [378.6882]
_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  2  0.0000  0.0000  0.5000  1.0
  Sn  Sn1  2  0.0000  0.0000  0.0000  1.0
  Se  Se2  4  0.1441  0.5000  0.2323  1.0
  O  O3  8  0.0303  0.2562  0.2150  1.0
  O  O4  4  0.2368  0.5000  0.4231  1.0
  O  O5  4  0.2446  0.0000  0.9535  1.0
]