data_[Na4Fe8O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Fe  1.8300  1.4000  0.8525
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [6.0520]
_cell_length_b [6.1887]
_cell_length_c [8.6331]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [Na(FeO2)2]
_chemical_formula_sum '[Na4 Fe8 O16]'
_cell_volume [323.3433]
_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  4  0.0000  0.2500  0.1246  1.0
  Fe  Fe1  4  0.0000  0.0000  0.5000  1.0
  Fe  Fe2  4  0.2500  0.2500  0.7500  1.0
  O  O3  8  0.0000  0.0462  0.7378  1.0
  O  O4  8  0.2198  0.2500  0.5279  1.0
]