data_[Na8Mg2Fe8O20]
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 [Cm]
_cell_length_a [7.9251]
_cell_length_b [14.1751]
_cell_length_c [5.4550]
_cell_angle_alpha [90.0000]
_cell_angle_beta [133.5014]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [Na4Mg(Fe2O5)2]
_chemical_formula_sum '[Na8 Mg2 Fe8 O20]'
_cell_volume [444.5052]
_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  0.2341  0.1618  0.4665  1
  Na  Na1  4  0.2951  0.3593  0.5502  1
  Mg  Mg2  2  0.0508  0.0000  0.4694  1
  Fe  Fe3  4  0.2579  0.2534  0.9884  1
  Fe  Fe4  2  0.1149  0.5000  0.9345  1
  Fe  Fe5  2  0.3414  0.0000  0.1595  1
  O  O6  4  0.0079  0.2702  0.4835  1
  O  O7  4  0.0101  0.2574  0.9877  1
  O  O8  4  0.1827  0.0985  0.8495  1
  O  O9  4  0.3234  0.4005  0.0771  1
  O  O10  2  0.1387  0.5000  0.3107  1
  O  O11  2  0.3160  0.0000  0.4884  1
]