data_Na(FeO2)2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   9.24
_cell_length_b   3.0
_cell_length_c   10.84
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   Na(FeO2)2
_chemical_formula_sum   'Na4 Fe8 O16'
_cell_volume   300.21
_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  1  0.24  0.75  0.12  1.0
  Na  Na1  1  0.38  0.25  0.71  1.0
  Na  Na2  1  0.86  0.75  0.13  1.0
  Na  Na3  1  1.0  0.25  0.71  1.0
  Fe  Fe4  1  0.58  0.75  0.62  1.0
  Fe  Fe5  1  0.77  0.75  0.31  1.0
  Fe  Fe6  1  0.85  0.25  0.72  1.0
  Fe  Fe7  1  0.04  0.25  0.21  1.0
  Fe  Fe8  1  0.2  0.75  0.63  1.0
  Fe  Fe9  1  0.39  0.75  0.11  1.0
  Fe  Fe10  1  0.47  0.25  0.53  1.0
  Fe  Fe11  1  0.66  0.25  0.21  1.0
  O  O12  1  0.22  0.25  0.09  1.0
  O  O13  1  0.7  0.75  0.8  1.0
  O  O14  1  0.05  0.25  0.63  1.0
  O  O15  1  0.9  0.25  0.2  1.0
  O  O16  1  0.72  0.75  0.79  1.0
  O  O17  1  0.56  0.75  0.21  1.0
  O  O18  1  0.92  0.25  0.22  1.0
  O  O19  1  0.4  0.75  0.51  1.0
  O  O20  1  0.84  0.25  0.33  1.0
  O  O21  1  0.32  0.75  0.62  1.0
  O  O22  1  0.67  0.25  0.62  1.0
  O  O23  1  0.52  0.25  0.05  1.0
  O  O24  1  0.34  0.75  0.63  1.0
  O  O25  1  0.18  0.75  0.2  1.0
  O  O26  1  0.54  0.25  0.04  1.0
  O  O27  1  0.02  0.75  0.74  1.0

data_Na(FeO2)2
_symmetry_space_group_name_H-M   P2_1/m
_cell_length_a   9.24
_cell_length_b   3.0
_cell_length_c   10.84
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   11
_chemical_formula_structural   Na(FeO2)2
_chemical_formula_sum   'Na4 Fe8 O16'
_cell_volume   300.21
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  '-x, -y, -z'
  3  '-x, y+1/2, -z'
  4  'x, -y+1/2, 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  2  0.12  0.75  0.71  1.0
  Na  Na1  2  0.26  0.25  0.29  1.0
  Fe  Fe2  2  0.08  0.75  0.21  1.0
  Fe  Fe3  2  0.27  0.75  0.69  1.0
  Fe  Fe4  2  0.35  0.25  0.11  1.0
  Fe  Fe5  2  0.46  0.75  0.21  1.0
  O  O6  2  0.06  0.75  0.79  1.0
  O  O7  2  0.1  0.25  0.67  1.0
  O  O8  2  0.2  0.75  0.2  1.0
  O  O9  2  0.22  0.75  0.21  1.0
  O  O10  2  0.28  0.75  0.09  1.0
  O  O11  2  0.4  0.25  0.63  1.0
  O  O12  2  0.42  0.25  0.62  1.0
  O  O13  2  0.45  0.75  0.8  1.0

Na Na Na Na Fe Fe Fe Fe Fe Fe Fe Fe O O O O O O O O O O O O O O O O