data_[K6Ce3Al6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Ce  1.1200  1.8500  1.0800
  Al  1.6100  1.2500  0.6750
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [6.0174]
_cell_length_b [6.0174]
_cell_length_c [18.3508]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [K2CeAl2O6]
_chemical_formula_sum '[K6 Ce3 Al6 O18]'
_cell_volume [575.4381]
_cell_formula_units_Z [3]
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  6  0.0000  0.0000  0.2012  1
  Ce  Ce1  3  0.0000  0.0000  0.0000  1
  Al  Al2  6  0.0000  0.0000  0.4086  1
  O  O3  18  0.0054  0.5027  0.2566  1
]