data_[Rb4Cr4O14]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P-1]
_cell_length_a [7.3098]
_cell_length_b [7.4409]
_cell_length_c [7.7283]
_cell_angle_alpha [109.8239]
_cell_angle_beta [91.0254]
_cell_angle_gamma [108.0876]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Rb2Cr2O7]
_chemical_formula_sum '[Rb4 Cr4 O14]'
_cell_volume [372.3166]
_cell_formula_units_Z [2]
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  0.1901  0.4147  0.2493  1
  Rb  Rb1  2  0.3856  0.9907  0.7473  1
  Cr  Cr2  2  0.0854  0.8829  0.2266  1
  Cr  Cr3  2  0.3000  0.4765  0.7524  1
  O  O4  2  0.0256  0.0764  0.3473  1
  O  O5  2  0.1282  0.3378  0.8632  1
  O  O6  2  0.1827  0.9255  0.0498  1
  O  O7  2  0.1874  0.5660  0.6356  1
  O  O8  2  0.2416  0.8458  0.3527  1
  O  O9  2  0.4062  0.3335  0.6138  1
  O  O10  2  0.4651  0.6655  0.9113  1
]