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 [Pban]
_cell_length_a [8.7119]
_cell_length_b [9.7753]
_cell_length_c [3.7343]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [50]
_chemical_formula_structural [SiO2]
_chemical_formula_sum '[Si8 O16]'
_cell_volume [318.0185]
_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  8  0.1746  0.3917  0.6523  1
  O  O1  4  0.0000  0.3604  0.5000  1
  O  O2  4  0.1416  0.5000  0.0000  1
  O  O3  4  0.1962  0.0000  0.5000  1
  O  O4  4  0.2500  0.2500  0.5000  1
]