data_[Na8Nb4O16F20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [Aea2]
_cell_length_a [10.7203]
_cell_length_b [9.3917]
_cell_length_c [7.5842]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [41]
_chemical_formula_structural [Na2NbO4F5]
_chemical_formula_sum '[Na8 Nb4 O16 F20]'
_cell_volume [763.5927]
_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  8  0.1409  0.1124  0.4674  1
  Nb  Nb1  4  0.0000  0.0000  0.0136  1
  O  O2  8  0.0649  0.4895  0.2576  1
  O  O3  8  0.2166  0.1915  0.7444  1
  F  F4  8  0.0078  0.2071  0.0125  1
  F  F5  8  0.1822  0.4913  0.5614  1
  F  F6  4  0.0000  0.0000  0.2805  1
]