data_[Rb16As4O2]
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 [C2/m]
_cell_length_a [21.1021]
_cell_length_b [5.8646]
_cell_length_c [7.4970]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.2149]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Rb8As2O]
_chemical_formula_sum '[Rb16 As4 O2]'
_cell_volume [876.1144]
_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  0.0066  0.0000  0.7731  1.0
  Rb  Rb1  4  0.0956  0.5000  0.3632  1.0
  Rb  Rb2  4  0.1242  0.5000  0.9101  1.0
  Rb  Rb3  4  0.2322  0.0000  0.2719  1.0
  As  As4  4  0.1524  0.0000  0.6486  1.0
  O  O5  2  0.0000  0.5000  0.0000  1.0
]