data_[Na24Y6Nb6Si18O72]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Y  1.2200  1.8000  1.0400
  Nb  1.6000  1.4500  0.8200
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3c]
_cell_length_a [9.3855]
_cell_length_b [9.3855]
_cell_length_c [22.8167]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [161]
_chemical_formula_structural [Na4YNb(SiO4)3]
_chemical_formula_sum '[Na24 Y6 Nb6 Si18 O72]'
_cell_volume [1740.5962]
_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
[
  Na  Na0  18  0.0407  0.3464  0.0815  1
  Na  Na1  6  0.0000  0.0000  0.4960  1
  Y  Y2  6  0.0000  0.0000  0.3486  1
  Nb  Nb3  6  0.0000  0.0000  0.1483  1
  Si  Si4  18  0.0074  0.7056  0.7510  1
  O  O5  18  0.0007  0.1870  0.9120  1
  O  O6  18  0.0298  0.1936  0.1943  1
  O  O7  18  0.1394  0.4473  0.9756  1
  O  O8  18  0.1851  0.4805  0.2547  1
]