data_[Rb4Sn4As4O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sn  1.9600  1.4500  0.8300
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [7.3702]
_cell_length_b [9.7510]
_cell_length_c [7.4788]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.6639]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [RbSnAsO5]
_chemical_formula_sum '[Rb4 Sn4 As4 O20]'
_cell_volume [484.4607]
_cell_formula_units_Z [4]
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  0.0000  0.3415  0.7500  1.0
  Sn  Sn1  4  0.0000  0.0000  0.0000  1.0
  As  As2  4  0.0000  0.3041  0.2500  1.0
  O  O3  8  0.0925  0.2026  0.1171  1.0
  O  O4  8  0.1896  0.4089  0.4110  1.0
  O  O5  4  0.0000  0.0673  0.7500  1.0
]