data_[Na4Nb2O2F10]
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 [Cm]
_cell_length_a [6.0241]
_cell_length_b [10.8446]
_cell_length_c [4.1635]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.3427]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [Na2NbOF5]
_chemical_formula_sum '[Na4 Nb2 O2 F10]'
_cell_volume [247.8153]
_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  0.0118  0.3377  0.0893  1.0
  Nb  Nb1  2  0.4833  0.5000  0.8758  1.0
  O  O2  2  0.2477  0.0000  0.7927  1.0
  F  F3  4  0.1525  0.8588  0.2055  1.0
  F  F4  4  0.2322  0.6400  0.7202  1.0
  F  F5  2  0.3163  0.5000  0.3019  1.0
]