data_[Rb4As2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.3231]
_cell_length_b [6.3860]
_cell_length_c [7.7396]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.3195]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [Rb2AsO4]
_chemical_formula_sum '[Rb4 As2 O8]'
_cell_volume [286.9903]
_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  0.3009  0.7500  0.3890  1.0
  Rb  Rb1  2  0.3144  0.2500  0.9821  1.0
  As  As2  2  0.0328  0.7500  0.7341  1.0
  O  O3  4  0.1274  0.5246  0.6563  1.0
  O  O4  2  0.1993  0.7500  0.9730  1.0
  O  O5  2  0.2553  0.2500  0.3222  1.0
]