data_[K4Nb4Al8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Nb  1.6000  1.4500  0.8200
  Al  1.6100  1.2500  0.6750
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [8.9075]
_cell_length_b [11.7110]
_cell_length_c [6.2061]
_cell_angle_alpha [90.0000]
_cell_angle_beta [112.8494]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [KNbAl2O6]
_chemical_formula_sum '[K4 Nb4 Al8 O24]'
_cell_volume [596.5858]
_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  0.1022  0.7500  1.0
  Nb  Nb1  4  0.0000  0.2032  0.2500  1.0
  Al  Al2  8  0.1211  0.4321  0.6577  1.0
  O  O3  8  0.0791  0.2866  0.5288  1.0
  O  O4  8  0.1156  0.4603  0.9449  1.0
  O  O5  8  0.1538  0.0998  0.2268  1.0
]