The compound described by SiO2 crystallizes in the tetragonal P4/n space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.772
_cell_length_b   11.772
_cell_length_c   4.375
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.346
_cell_formula_units_Z   16
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  0.737  0.079  0.288  1.0
  Si  Si1  1  0.762  0.584  0.266  1.0
  Si  Si2  1  0.579  0.763  0.288  1.0
  Si  Si3  1  0.084  0.738  0.266  1.0
  Si  Si4  1  0.584  0.238  0.734  1.0
  Si  Si5  1  0.263  0.921  0.288  1.0
  Si  Si6  1  0.416  0.762  0.734  1.0
  Si  Si7  1  0.238  0.416  0.266  1.0
  Si  Si8  1  0.763  0.421  0.712  1.0
  Si  Si9  1  0.079  0.263  0.712  1.0
  Si  Si10  1  0.916  0.262  0.266  1.0
  Si  Si11  1  0.262  0.084  0.734  1.0
  Si  Si12  1  0.921  0.737  0.712  1.0
  Si  Si13  1  0.421  0.237  0.288  1.0
  Si  Si14  1  0.738  0.916  0.734  1.0
  Si  Si15  1  0.237  0.579  0.712  1.0
  O  O16  1  0.825  0.820  0.864  1.0
  O  O17  1  0.861  0.642  0.486  1.0
  O  O18  1  0.188  0.495  0.985  1.0
  O  O19  1  0.501  0.312  0.513  1.0
  O  O20  1  0.001  0.812  0.487  1.0
  O  O21  1  0.642  0.139  0.514  1.0
  O  O22  1  0.820  0.175  0.136  1.0
  O  O23  1  0.680  0.325  0.864  1.0
  O  O24  1  0.175  0.180  0.864  1.0
  O  O25  1  0.358  0.861  0.514  1.0
  O  O26  1  0.999  0.188  0.487  1.0
  O  O27  1  0.499  0.688  0.513  1.0
  O  O28  1  0.675  0.680  0.136  1.0
  O  O29  1  0.180  0.825  0.136  1.0
  O  O30  1  0.812  0.505  0.985  1.0
  O  O31  1  0.188  0.001  0.513  1.0
  O  O32  1  0.995  0.312  0.985  1.0
  O  O33  1  0.812  0.999  0.513  1.0
  O  O34  1  0.325  0.320  0.136  1.0
  O  O35  1  0.495  0.812  0.015  1.0
  O  O36  1  0.320  0.675  0.864  1.0
  O  O37  1  0.688  0.501  0.487  1.0
  O  O38  1  0.505  0.188  0.015  1.0
  O  O39  1  0.858  0.361  0.486  1.0
  O  O40  1  0.639  0.858  0.514  1.0
  O  O41  1  0.688  0.995  0.015  1.0
  O  O42  1  0.005  0.688  0.985  1.0
  O  O43  1  0.142  0.639  0.486  1.0
  O  O44  1  0.312  0.005  0.015  1.0
  O  O45  1  0.361  0.142  0.514  1.0
  O  O46  1  0.312  0.499  0.487  1.0
  O  O47  1  0.139  0.358  0.486  1.0
[/CIF]
.
The compound described by SiO2 crystallizes in the tetragonal P4/n space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.772
_cell_length_b   11.772
_cell_length_c   4.375
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   606.346
_cell_formula_units_Z   16
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  0.737  0.079  0.288  1.0
  Si  Si1  1  0.762  0.584  0.266  1.0
  Si  Si2  1  0.579  0.763  0.288  1.0
  Si  Si3  1  0.084  0.738  0.266  1.0
  Si  Si4  1  0.584  0.238  0.734  1.0
  Si  Si5  1  0.263  0.921  0.288  1.0
  Si  Si6  1  0.416  0.762  0.734  1.0
  Si  Si7  1  0.238  0.416  0.266  1.0
  Si  Si8  1  0.763  0.421  0.712  1.0
  Si  Si9  1  0.079  0.263  0.712  1.0
  Si  Si10  1  0.916  0.262  0.266  1.0
  Si  Si11  1  0.262  0.084  0.734  1.0
  Si  Si12  1  0.921  0.737  0.712  1.0
  Si  Si13  1  0.421  0.237  0.288  1.0
  Si  Si14  1  0.738  0.916  0.734  1.0
  Si  Si15  1  0.237  0.579  0.712  1.0
  O  O16  1  0.825  0.820  0.864  1.0
  O  O17  1  0.861  0.642  0.486  1.0
  O  O18  1  0.188  0.495  0.985  1.0
  O  O19  1  0.501  0.312  0.513  1.0
  O  O20  1  0.001  0.812  0.487  1.0
  O  O21  1  0.642  0.139  0.514  1.0
  O  O22  1  0.820  0.175  0.136  1.0
  O  O23  1  0.680  0.325  0.864  1.0
  O  O24  1  0.175  0.180  0.864  1.0
  O  O25  1  0.358  0.861  0.514  1.0
  O  O26  1  0.999  0.188  0.487  1.0
  O  O27  1  0.499  0.688  0.513  1.0
  O  O28  1  0.675  0.680  0.136  1.0
  O  O29  1  0.180  0.825  0.136  1.0
  O  O30  1  0.812  0.505  0.985  1.0
  O  O31  1  0.188  0.001  0.513  1.0
  O  O32  1  0.995  0.312  0.985  1.0
  O  O33  1  0.812  0.999  0.513  1.0
  O  O34  1  0.325  0.320  0.136  1.0
  O  O35  1  0.495  0.812  0.015  1.0
  O  O36  1  0.320  0.675  0.864  1.0
  O  O37  1  0.688  0.501  0.487  1.0
  O  O38  1  0.505  0.188  0.015  1.0
  O  O39  1  0.858  0.361  0.486  1.0
  O  O40  1  0.639  0.858  0.514  1.0
  O  O41  1  0.688  0.995  0.015  1.0
  O  O42  1  0.005  0.688  0.985  1.0
  O  O43  1  0.142  0.639  0.486  1.0
  O  O44  1  0.312  0.005  0.015  1.0
  O  O45  1  0.361  0.142  0.514  1.0
  O  O46  1  0.312  0.499  0.487  1.0
  O  O47  1  0.139  0.358  0.486  1.0
[/CIF]
.