The crystal structure described by SiO2 crystallizes in the tetragonal P4/nnc space group. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.279
_cell_length_b   11.279
_cell_length_c   5.164
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   656.896
_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  0.381  0.807  0.377  1.0
  Si  Si1  1  0.193  0.619  0.623  1.0
  Si  Si2  1  0.193  0.381  0.377  1.0
  Si  Si3  1  0.881  0.693  0.877  1.0
  Si  Si4  1  0.307  0.119  0.123  1.0
  Si  Si5  1  0.807  0.619  0.377  1.0
  Si  Si6  1  0.119  0.307  0.877  1.0
  Si  Si7  1  0.619  0.193  0.377  1.0
  Si  Si8  1  0.693  0.881  0.123  1.0
  Si  Si9  1  0.119  0.693  0.123  1.0
  Si  Si10  1  0.381  0.193  0.623  1.0
  Si  Si11  1  0.881  0.307  0.123  1.0
  Si  Si12  1  0.307  0.881  0.877  1.0
  Si  Si13  1  0.619  0.807  0.623  1.0
  Si  Si14  1  0.807  0.381  0.623  1.0
  Si  Si15  1  0.693  0.119  0.877  1.0
  O  O16  1  0.133  0.409  0.099  1.0
  O  O17  1  0.909  0.367  0.401  1.0
  O  O18  1  0.091  0.633  0.401  1.0
  O  O19  1  0.250  0.750  0.750  1.0
  O  O20  1  0.500  0.268  0.500  1.0
  O  O21  1  0.867  0.591  0.099  1.0
  O  O22  1  0.750  0.750  0.250  1.0
  O  O23  1  0.500  0.732  0.500  1.0
  O  O24  1  0.633  0.909  0.401  1.0
  O  O25  1  0.367  0.909  0.599  1.0
  O  O26  1  0.732  0.500  0.500  1.0
  O  O27  1  0.000  0.768  0.000  1.0
  O  O28  1  0.250  0.750  0.250  1.0
  O  O29  1  0.867  0.409  0.901  1.0
  O  O30  1  0.250  0.250  0.250  1.0
  O  O31  1  0.133  0.591  0.901  1.0
  O  O32  1  0.633  0.091  0.599  1.0
  O  O33  1  0.268  0.500  0.500  1.0
  O  O34  1  0.232  0.000  0.000  1.0
  O  O35  1  0.367  0.091  0.401  1.0
  O  O36  1  0.768  0.000  0.000  1.0
  O  O37  1  0.750  0.750  0.750  1.0
  O  O38  1  0.591  0.133  0.099  1.0
  O  O39  1  0.909  0.633  0.599  1.0
  O  O40  1  0.250  0.250  0.750  1.0
  O  O41  1  0.000  0.232  0.000  1.0
  O  O42  1  0.409  0.133  0.901  1.0
  O  O43  1  0.750  0.250  0.250  1.0
  O  O44  1  0.591  0.867  0.901  1.0
  O  O45  1  0.091  0.367  0.599  1.0
  O  O46  1  0.750  0.250  0.750  1.0
  O  O47  1  0.409  0.867  0.099  1.0
[/CIF]
.
The crystal structure described by SiO2 crystallizes in the tetragonal P4/nnc space group. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form distorted corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a linear geometry to two equivalent Si(1) atoms. In the third O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF file [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   11.279
_cell_length_b   11.279
_cell_length_c   5.164
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   656.896
_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  0.381  0.807  0.377  1.0
  Si  Si1  1  0.193  0.619  0.623  1.0
  Si  Si2  1  0.193  0.381  0.377  1.0
  Si  Si3  1  0.881  0.693  0.877  1.0
  Si  Si4  1  0.307  0.119  0.123  1.0
  Si  Si5  1  0.807  0.619  0.377  1.0
  Si  Si6  1  0.119  0.307  0.877  1.0
  Si  Si7  1  0.619  0.193  0.377  1.0
  Si  Si8  1  0.693  0.881  0.123  1.0
  Si  Si9  1  0.119  0.693  0.123  1.0
  Si  Si10  1  0.381  0.193  0.623  1.0
  Si  Si11  1  0.881  0.307  0.123  1.0
  Si  Si12  1  0.307  0.881  0.877  1.0
  Si  Si13  1  0.619  0.807  0.623  1.0
  Si  Si14  1  0.807  0.381  0.623  1.0
  Si  Si15  1  0.693  0.119  0.877  1.0
  O  O16  1  0.133  0.409  0.099  1.0
  O  O17  1  0.909  0.367  0.401  1.0
  O  O18  1  0.091  0.633  0.401  1.0
  O  O19  1  0.250  0.750  0.750  1.0
  O  O20  1  0.500  0.268  0.500  1.0
  O  O21  1  0.867  0.591  0.099  1.0
  O  O22  1  0.750  0.750  0.250  1.0
  O  O23  1  0.500  0.732  0.500  1.0
  O  O24  1  0.633  0.909  0.401  1.0
  O  O25  1  0.367  0.909  0.599  1.0
  O  O26  1  0.732  0.500  0.500  1.0
  O  O27  1  0.000  0.768  0.000  1.0
  O  O28  1  0.250  0.750  0.250  1.0
  O  O29  1  0.867  0.409  0.901  1.0
  O  O30  1  0.250  0.250  0.250  1.0
  O  O31  1  0.133  0.591  0.901  1.0
  O  O32  1  0.633  0.091  0.599  1.0
  O  O33  1  0.268  0.500  0.500  1.0
  O  O34  1  0.232  0.000  0.000  1.0
  O  O35  1  0.367  0.091  0.401  1.0
  O  O36  1  0.768  0.000  0.000  1.0
  O  O37  1  0.750  0.750  0.750  1.0
  O  O38  1  0.591  0.133  0.099  1.0
  O  O39  1  0.909  0.633  0.599  1.0
  O  O40  1  0.250  0.250  0.750  1.0
  O  O41  1  0.000  0.232  0.000  1.0
  O  O42  1  0.409  0.133  0.901  1.0
  O  O43  1  0.750  0.250  0.250  1.0
  O  O44  1  0.591  0.867  0.901  1.0
  O  O45  1  0.091  0.367  0.599  1.0
  O  O46  1  0.750  0.250  0.750  1.0
  O  O47  1  0.409  0.867  0.099  1.0
[/CIF]
.