data_[Rb6Fe2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Fe  1.8300  1.4000  0.8525
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [10.5507]
_cell_length_b [6.5008]
_cell_length_c [6.6559]
_cell_angle_alpha [90.0000]
_cell_angle_beta [128.8866]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [Rb3FeO4]
_chemical_formula_sum '[Rb6 Fe2 O8]'
_cell_volume [355.3455]
_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  4  0.2467  0.4560  0.2587  1.0
  Rb  Rb1  2  0.0000  0.9371  0.0000  1.0
  Fe  Fe2  2  0.0000  0.4968  0.5000  1.0
  O  O3  4  0.0470  0.6483  0.7569  1.0
  O  O4  4  0.1616  0.3533  0.5659  1.0
]