data_[Rb4Bi2As2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Bi  2.0200  1.6000  1.0350
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [7.8656]
_cell_length_b [8.4553]
_cell_length_c [5.7214]
_cell_angle_alpha [90.0000]
_cell_angle_beta [122.9234]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [Rb2BiAsO4]
_chemical_formula_sum '[Rb4 Bi2 As2 O8]'
_cell_volume [319.3985]
_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  0.0000  0.3536  0.5000  1
  Rb  Rb1  2  0.0000  0.6323  0.0000  1
  Bi  Bi2  2  0.0000  0.9033  0.5000  1
  As  As3  2  0.0000  0.0820  0.0000  1
  O  O4  4  0.1733  0.9513  0.9779  1
  O  O5  4  0.1815  0.0630  0.4464  1
]