data_[K8Na4Nb4O8F16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  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 [C2/m]
_cell_length_a [8.5555]
_cell_length_b [8.6973]
_cell_length_c [8.5862]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.1495]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [K2NaNb(OF2)2]
_chemical_formula_sum '[K8 Na4 Nb4 O8 F16]'
_cell_volume [638.8998]
_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
[
  K  K0  8  0.2489  0.2485  0.2484  1.0
  Na  Na1  2  0.0000  0.0000  0.0000  1.0
  Na  Na2  2  0.0000  0.5000  0.5000  1.0
  Nb  Nb3  2  0.0000  0.0000  0.5000  1.0
  Nb  Nb4  2  0.0000  0.5000  0.0000  1.0
  O  O5  4  0.0000  0.2804  0.0000  1.0
  O  O6  4  0.2186  0.0000  0.4605  1.0
  F  F7  4  0.0000  0.2331  0.5000  1.0
  F  F8  4  0.0433  0.0000  0.7342  1.0
  F  F9  4  0.0436  0.5000  0.2339  1.0
  F  F10  4  0.2358  0.5000  0.9562  1.0
]