data_[Na3Sb3As6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sb  2.0500  1.4500  0.8300
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.4914]
_cell_length_b [5.4914]
_cell_length_c [18.8249]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaSb(AsO3)2]
_chemical_formula_sum '[Na3 Sb3 As6 O18]'
_cell_volume [491.6290]
_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  0.4446  1.0
  Sb  Sb1  3  0.0000  0.0000  0.0178  1.0
  As  As2  3  0.0000  0.0000  0.2464  1.0
  As  As3  3  0.0000  0.0000  0.6946  1.0
  O  O4  9  0.0071  0.4377  0.4132  1.0
  O  O5  9  0.0939  0.7559  0.9567  1.0
]