data_[K4Na4Nb8O24]
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
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [10.3223]
_cell_length_b [11.7818]
_cell_length_c [6.7471]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.5380]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [KNaNb2O6]
_chemical_formula_sum '[K4 Na4 Nb8 O24]'
_cell_volume [752.2738]
_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  4  0.0000  0.1072  0.2500  1.0
  Na  Na1  4  0.0000  0.2014  0.7500  1.0
  Nb  Nb2  8  0.1530  0.4266  0.1877  1.0
  O  O3  8  0.1043  0.2835  0.0902  1.0
  O  O4  8  0.1085  0.4656  0.4434  1.0
  O  O5  8  0.1549  0.0732  0.6927  1.0
]