data_[Rb2Fe2P2O8]
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
  P  2.1900  1.0000  0.5500
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.3325]
_cell_length_b [5.7536]
_cell_length_c [7.3386]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.1510]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbFePO4]
_chemical_formula_sum '[Rb2 Fe2 P2 O8]'
_cell_volume [215.1429]
_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  0.2913  0.2500  0.0588  1.0
  Fe  Fe1  2  0.2004  0.2500  0.5226  1.0
  P  P2  2  0.2527  0.7500  0.3567  1.0
  O  O3  4  0.0598  0.5362  0.3307  1.0
  O  O4  2  0.4134  0.7500  0.2119  1.0
  O  O5  2  0.4481  0.7500  0.5597  1.0
]