data_[Si4Bi8O20]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  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 [Cmc2_1]
_cell_length_a [15.4088]
_cell_length_b [5.5538]
_cell_length_c [5.3924]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [SiBi2O5]
_chemical_formula_sum '[Si4 Bi8 O20]'
_cell_volume [461.4638]
_cell_formula_units_Z [4]
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
[
  Si  Si0  4  0.0000  0.3231  0.6955  1.0
  Bi  Bi1  8  0.1659  0.2193  0.2609  1.0
  O  O2  8  0.0907  0.1755  0.6712  1.0
  O  O3  8  0.2489  0.4897  0.4879  1.0
  O  O4  4  0.0000  0.4701  0.9666  1.0
]