data_[Si8O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cc]
_cell_length_a [5.1240]
_cell_length_b [8.7975]
_cell_length_c [8.5330]
_cell_angle_alpha [90.0000]
_cell_angle_beta [91.5800]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [9]
_chemical_formula_structural [SiO2]
_chemical_formula_sum '[Si8 O16]'
_cell_volume [384.5101]
_cell_formula_units_Z [8]
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  0.0758  0.3068  0.2119  1.0
  Si  Si1  4  0.0765  0.3591  0.8375  1.0
  O  O2  4  0.0895  0.3320  0.0248  1.0
  O  O3  4  0.1465  0.4638  0.3041  1.0
  O  O4  4  0.2835  0.2485  0.7530  1.0
  O  O5  4  0.2854  0.1770  0.2663  1.0
]