The structure described by SiO2 crystallizes in the tetragonal P4_322 space group. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted corner-sharing SiO4 trigonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.685
_cell_length_b   4.685
_cell_length_c   15.771
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   346.110
_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  1  0.576  0.023  0.097  1.0
  Si  Si1  1  0.977  0.576  0.847  1.0
  Si  Si2  1  0.023  0.424  0.347  1.0
  Si  Si3  1  0.424  0.023  0.903  1.0
  Si  Si4  1  0.977  0.424  0.653  1.0
  Si  Si5  1  0.023  0.576  0.153  1.0
  Si  Si6  1  0.424  0.977  0.597  1.0
  Si  Si7  1  0.576  0.977  0.403  1.0
  O  O8  1  0.886  0.500  0.750  1.0
  O  O9  1  0.798  0.299  0.127  1.0
  O  O10  1  0.701  0.798  0.877  1.0
  O  O11  1  0.202  0.299  0.873  1.0
  O  O12  1  0.500  0.114  0.000  1.0
  O  O13  1  0.200  0.200  0.625  1.0
  O  O14  1  0.200  0.800  0.875  1.0
  O  O15  1  0.800  0.800  0.125  1.0
  O  O16  1  0.299  0.202  0.377  1.0
  O  O17  1  0.800  0.200  0.375  1.0
  O  O18  1  0.798  0.701  0.373  1.0
  O  O19  1  0.202  0.701  0.627  1.0
  O  O20  1  0.500  0.886  0.500  1.0
  O  O21  1  0.114  0.500  0.250  1.0
  O  O22  1  0.701  0.202  0.623  1.0
  O  O23  1  0.299  0.798  0.123  1.0
[/CIF]
.
The structure described by SiO2 crystallizes in the tetragonal P4_322 space group. Si(1) is bonded to one O(1), one O(3), and two equivalent O(2) atoms to form distorted corner-sharing SiO4 trigonal pyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(3) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. is represented by the Crystallographic Information File (CIF) [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.685
_cell_length_b   4.685
_cell_length_c   15.771
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   346.110
_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  1  0.576  0.023  0.097  1.0
  Si  Si1  1  0.977  0.576  0.847  1.0
  Si  Si2  1  0.023  0.424  0.347  1.0
  Si  Si3  1  0.424  0.023  0.903  1.0
  Si  Si4  1  0.977  0.424  0.653  1.0
  Si  Si5  1  0.023  0.576  0.153  1.0
  Si  Si6  1  0.424  0.977  0.597  1.0
  Si  Si7  1  0.576  0.977  0.403  1.0
  O  O8  1  0.886  0.500  0.750  1.0
  O  O9  1  0.798  0.299  0.127  1.0
  O  O10  1  0.701  0.798  0.877  1.0
  O  O11  1  0.202  0.299  0.873  1.0
  O  O12  1  0.500  0.114  0.000  1.0
  O  O13  1  0.200  0.200  0.625  1.0
  O  O14  1  0.200  0.800  0.875  1.0
  O  O15  1  0.800  0.800  0.125  1.0
  O  O16  1  0.299  0.202  0.377  1.0
  O  O17  1  0.800  0.200  0.375  1.0
  O  O18  1  0.798  0.701  0.373  1.0
  O  O19  1  0.202  0.701  0.627  1.0
  O  O20  1  0.500  0.886  0.500  1.0
  O  O21  1  0.114  0.500  0.250  1.0
  O  O22  1  0.701  0.202  0.623  1.0
  O  O23  1  0.299  0.798  0.123  1.0
[/CIF]
.