data_[Rb2Na16Sn8]
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 [I4/mmm]
_cell_length_a [11.1494]
_cell_length_b [11.1494]
_cell_length_c [6.7044]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Rb(Na2Sn)4]
_chemical_formula_sum '[Rb2 Na16 Sn8]'
_cell_volume [833.4226]
_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  0.0000  0.0000  1
  Na  Na1  8  0.0000  0.2300  0.5000  1
  Na  Na2  8  0.0000  0.3301  0.0000  1
  Sn  Sn3  8  0.2500  0.2500  0.2500  1
]