data_[Na2Ca2Fe4Si8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ca  1.0000  1.8000  1.1400
  Fe  1.8300  1.4000  0.8525
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2]
_cell_length_a [9.8980]
_cell_length_b [8.9940]
_cell_length_c [5.3569]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.6942]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [5]
_chemical_formula_structural [NaCaFe2(SiO3)4]
_chemical_formula_sum '[Na2 Ca2 Fe4 Si8 O24]'
_cell_volume [456.7889]
_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  0.7010  0.5000  1
  Ca  Ca1  2  0.0000  0.3000  0.0000  1
  Fe  Fe2  2  0.0000  0.0942  0.5000  1
  Fe  Fe3  2  0.0000  0.8984  0.0000  1
  Si  Si4  4  0.2106  0.5916  0.0110  1
  Si  Si5  4  0.2123  0.4101  0.5194  1
  O  O6  4  0.1155  0.9170  0.3797  1
  O  O7  4  0.1174  0.0844  0.9095  1
  O  O8  4  0.1382  0.7526  0.9389  1
  O  O9  4  0.1388  0.2514  0.4309  1
  O  O10  4  0.1457  0.4845  0.7458  1
  O  O11  4  0.1543  0.5128  0.2450  1
]