data_[Na6Mg4Fe2O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Fe  1.8300  1.4000  0.8525
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [5.2549]
_cell_length_b [9.0969]
_cell_length_c [5.6609]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.1957]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na3Mg2FeO6]
_chemical_formula_sum '[Na6 Mg4 Fe2 O12]'
_cell_volume [257.0799]
_cell_formula_units_Z [2]
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  0.1664  0.5000  1.0
  Na  Na1  2  0.0000  0.5000  0.5000  1.0
  Mg  Mg2  4  0.0000  0.3333  0.0000  1.0
  Fe  Fe3  2  0.0000  0.0000  0.0000  1.0
  O  O4  8  0.2211  0.1546  0.1998  1.0
  O  O5  4  0.2419  0.0000  0.8035  1.0
]