data_[Rb8Na20Sn8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Na  0.9300  1.8000  1.1600
  Sn  1.9600  1.4500  0.8300
]
_symmetry_space_group_name_H-M [Ima2]
_cell_length_a [23.4163]
_cell_length_b [9.9304]
_cell_length_c [5.9187]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [46]
_chemical_formula_structural [Rb2Na5Sn2]
_chemical_formula_sum '[Rb8 Na20 Sn8]'
_cell_volume [1376.2931]
_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  8  0.1563  0.1299  0.4991  1.0
  Na  Na1  8  0.0007  0.6667  0.1980  1.0
  Na  Na2  8  0.1225  0.6094  0.5378  1.0
  Na  Na3  4  0.2500  0.6725  0.9977  1.0
  Sn  Sn4  4  0.0000  0.0000  0.2026  1.0
  Sn  Sn5  4  0.2500  0.5009  0.4939  1.0
]