data_[Rb8Al4O4F20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Al  1.6100  1.2500  0.6750
  O  3.4400  0.6000  1.2600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [9.7608]
_cell_length_b [8.2645]
_cell_length_c [7.6356]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Rb2AlOF5]
_chemical_formula_sum '[Rb8 Al4 O4 F20]'
_cell_volume [615.9513]
_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
[
  Rb  Rb0  8  0.2271  0.2716  0.7500  1
  Al  Al1  4  0.0000  0.0000  0.0000  1
  O  O2  4  0.0000  0.4297  0.2500  1
  F  F3  8  0.0000  0.2191  0.0083  1
  F  F4  8  0.1843  0.0000  0.0000  1
  F  F5  4  0.0000  0.0108  0.7500  1
]