data_[Rb2Al2Sb2O7]
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
  Sb  2.0500  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-3m1]
_cell_length_a [5.7447]
_cell_length_b [5.7447]
_cell_length_c [8.6292]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [164]
_chemical_formula_structural [Rb2Al2Sb2O7]
_chemical_formula_sum '[Rb2 Al2 Sb2 O7]'
_cell_volume [246.6252]
_cell_formula_units_Z [1]
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  2  0.3333  0.6667  0.4062  1
  Al  Al1  2  0.0000  0.0000  0.1995  1
  Sb  Sb2  2  0.3333  0.6667  0.8465  1
  O  O3  6  0.1670  0.3340  0.7219  1
  O  O4  1  0.0000  0.0000  0.0000  1
]