data_[Na8Ir4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ir  2.2000  1.3500  0.7650
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Fmm2]
_cell_length_a [7.6152]
_cell_length_b [8.7639]
_cell_length_c [7.1946]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [42]
_chemical_formula_structural [Na2IrO4]
_chemical_formula_sum '[Na8 Ir4 O16]'
_cell_volume [480.1539]
_cell_formula_units_Z [4]
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  8  0.2500  0.2500  0.2269  1.0
  Ir  Ir1  4  0.0000  0.0000  0.0051  1.0
  O  O2  8  0.0000  0.1966  0.9187  1.0
  O  O3  8  0.2210  0.0000  0.1019  1.0
]