data_[Sr2Mg2Fe2O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  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 [11.1764]
_cell_length_b [4.2934]
_cell_length_c [3.3616]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.8004]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [SrMgFeO3]
_chemical_formula_sum '[Sr2 Mg2 Fe2 O6]'
_cell_volume [154.4203]
_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
[
  Sr  Sr0  2  0.1279  0.5000  0.6343  1
  Mg  Mg1  2  0.3188  0.0000  0.3130  1
  Fe  Fe2  2  0.4441  0.5000  0.9272  1
  O  O3  2  0.1301  0.0000  0.1575  1
  O  O4  2  0.3199  0.5000  0.3173  1
  O  O5  2  0.4277  0.0000  0.9174  1
]