data_[K18Na6Si18Sn12O72]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  Si  1.9000  1.1000  0.5400
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R-3c]
_cell_length_a [9.3612]
_cell_length_b [9.3612]
_cell_length_c [22.6336]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [167]
_chemical_formula_structural [K3NaSi3(SnO6)2]
_chemical_formula_sum '[K18 Na6 Si18 Sn12 O72]'
_cell_volume [1717.7016]
_cell_formula_units_Z [6]
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
[
  K  K0  18  0.0000  0.3515  0.7500  1
  Na  Na1  6  0.0000  0.0000  0.0000  1
  Si  Si2  18  0.0000  0.2960  0.2500  1
  Sn  Sn3  12  0.0000  0.0000  0.3510  1
  O  O4  36  0.0161  0.1841  0.9111  1
  O  O5  36  0.0341  0.8246  0.6924  1
]