data_[Rb4Se2O4F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.3135]
_cell_length_b [5.9901]
_cell_length_c [5.0468]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.4286]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb2Se(OF2)2]
_chemical_formula_sum '[Rb4 Se2 O4 F8]'
_cell_volume [311.6899]
_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  0.1710  0.5000  0.7913  1.0
  Se  Se1  2  0.0000  0.0000  0.5000  1.0
  O  O2  4  0.1366  0.0000  0.6839  1.0
  F  F3  8  0.0711  0.2289  0.2848  1.0
]