data_[Rb2Nb2As4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Nb  1.6000  1.4500  0.8200
  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 [9.0582]
_cell_length_b [5.5125]
_cell_length_c [9.2730]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.1510]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [RbNb(AsO4)2]
_chemical_formula_sum '[Rb2 Nb2 As4 O16]'
_cell_volume [444.7596]
_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  0.5000  0.5000  1.0
  Nb  Nb1  2  0.0000  0.0000  0.0000  1.0
  As  As2  4  0.2092  0.5000  0.1977  1.0
  O  O3  8  0.0849  0.2535  0.1569  1.0
  O  O4  4  0.1838  0.0000  0.6251  1.0
  O  O5  4  0.1925  0.0000  0.9392  1.0
]