data_[Fe4Si4Bi2O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Fe  1.8300  1.4000  0.8525
  Si  1.9000  1.1000  0.5400
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cm]
_cell_length_a [5.3105]
_cell_length_b [8.9846]
_cell_length_c [8.0431]
_cell_angle_alpha [90.0000]
_cell_angle_beta [102.1115]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [Fe2Si2BiO9]
_chemical_formula_sum '[Fe4 Si4 Bi2 O18]'
_cell_volume [375.2121]
_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
[
  Fe  Fe0  4  0.4898  0.1631  0.9990  1.0
  Si  Si1  4  0.1974  0.3288  0.6417  1.0
  Bi  Bi2  2  0.0819  0.0000  0.2702  1.0
  O  O3  4  0.2091  0.1813  0.1336  1.0
  O  O4  4  0.2608  0.3117  0.8474  1.0
  O  O5  4  0.4219  0.2519  0.5568  1.0
  O  O6  2  0.1729  0.5000  0.5722  1.0
  O  O7  2  0.1837  0.5000  0.1417  1.0
  O  O8  2  0.3417  0.0000  0.8650  1.0
]