data_[Na6Al3Ag3F18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Al  1.6100  1.2500  0.6750
  Ag  1.9300  1.6000  1.0867
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.6643]
_cell_length_b [5.6643]
_cell_length_c [14.7775]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Na2AlAgF6]
_chemical_formula_sum '[Na6 Al3 Ag3 F18]'
_cell_volume [410.5992]
_cell_formula_units_Z [3]
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
[
  Na  Na0  3  0.0000  0.0000  0.2953  1.0
  Na  Na1  3  0.0000  0.0000  0.7812  1.0
  Al  Al2  3  0.0000  0.0000  0.9924  1.0
  Ag  Ag3  3  0.0000  0.0000  0.5083  1.0
  F  F4  9  0.0212  0.2826  0.0588  1.0
  F  F5  9  0.0759  0.6693  0.5820  1.0
]