data_[Na2Fe2As4O14]
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
  As  2.1800  1.1500  0.6600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [6.7580]
_cell_length_b [8.4588]
_cell_length_c [4.7437]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.9973]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [NaFeAs2O7]
_chemical_formula_sum '[Na2 Fe2 As4 O14]'
_cell_volume [265.2484]
_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  2  0.0000  0.7408  0.0000  1
  Fe  Fe1  2  0.0000  0.1267  0.0000  1
  As  As2  4  0.2188  0.4595  0.4120  1
  O  O3  4  0.1126  0.9455  0.2712  1
  O  O4  4  0.1694  0.2813  0.2543  1
  O  O5  4  0.2342  0.1032  0.8153  1
  O  O6  2  0.0000  0.5473  0.5000  1
]