data_[Rb8Sb8O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [I2_13]
_cell_length_a [8.6555]
_cell_length_b [8.6555]
_cell_length_c [8.6555]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [199]
_chemical_formula_structural [Rb2Sb2O3]
_chemical_formula_sum '[Rb8 Sb8 O12]'
_cell_volume [648.4456]
_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  0.2485  0.2485  0.2485  1
  Sb  Sb1  8  0.0077  0.0077  0.0077  1
  O  O2  12  0.0000  0.2500  0.9954  1
]