The structure described by SiO2 crystallizes in the cubic Fd-3m space group. Si(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees 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   10.813
_cell_length_b   10.813
_cell_length_c   10.813
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   894.072
_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  0.306  0.565  0.565  1.0
  Si  Si1  1  0.685  0.685  0.685  1.0
  Si  Si2  1  0.685  0.685  0.944  1.0
  Si  Si3  1  0.685  0.944  0.685  1.0
  Si  Si4  1  0.565  0.306  0.565  1.0
  Si  Si5  1  0.565  0.565  0.565  1.0
  Si  Si6  1  0.565  0.565  0.306  1.0
  Si  Si7  1  0.944  0.685  0.685  1.0
  O  O8  1  0.625  0.125  0.625  1.0
  O  O9  1  0.625  0.625  0.625  1.0
  O  O10  1  0.625  0.625  0.125  1.0
  O  O11  1  0.125  0.625  0.625  1.0
  O  O12  1  0.873  0.627  0.627  1.0
  O  O13  1  0.623  0.377  0.377  1.0
  O  O14  1  0.627  0.873  0.627  1.0
  O  O15  1  0.627  0.627  0.873  1.0
  O  O16  1  0.627  0.873  0.873  1.0
  O  O17  1  0.623  0.377  0.623  1.0
  O  O18  1  0.377  0.623  0.377  1.0
  O  O19  1  0.377  0.377  0.623  1.0
  O  O20  1  0.623  0.623  0.377  1.0
  O  O21  1  0.377  0.623  0.623  1.0
  O  O22  1  0.873  0.627  0.873  1.0
  O  O23  1  0.873  0.873  0.627  1.0
[/CIF]
.
The structure described by SiO2 crystallizes in the cubic Fd-3m space group. Si(1) is bonded to one O(1) and three equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a linear geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 120 degrees 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   10.813
_cell_length_b   10.813
_cell_length_c   10.813
_cell_angle_alpha   60.000
_cell_angle_beta   60.000
_cell_angle_gamma   60.000
_symmetry_Int_Tables_number   1
_cell_volume   894.072
_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  0.306  0.565  0.565  1.0
  Si  Si1  1  0.685  0.685  0.685  1.0
  Si  Si2  1  0.685  0.685  0.944  1.0
  Si  Si3  1  0.685  0.944  0.685  1.0
  Si  Si4  1  0.565  0.306  0.565  1.0
  Si  Si5  1  0.565  0.565  0.565  1.0
  Si  Si6  1  0.565  0.565  0.306  1.0
  Si  Si7  1  0.944  0.685  0.685  1.0
  O  O8  1  0.625  0.125  0.625  1.0
  O  O9  1  0.625  0.625  0.625  1.0
  O  O10  1  0.625  0.625  0.125  1.0
  O  O11  1  0.125  0.625  0.625  1.0
  O  O12  1  0.873  0.627  0.627  1.0
  O  O13  1  0.623  0.377  0.377  1.0
  O  O14  1  0.627  0.873  0.627  1.0
  O  O15  1  0.627  0.627  0.873  1.0
  O  O16  1  0.627  0.873  0.873  1.0
  O  O17  1  0.623  0.377  0.623  1.0
  O  O18  1  0.377  0.623  0.377  1.0
  O  O19  1  0.377  0.377  0.623  1.0
  O  O20  1  0.623  0.623  0.377  1.0
  O  O21  1  0.377  0.623  0.623  1.0
  O  O22  1  0.873  0.627  0.873  1.0
  O  O23  1  0.873  0.873  0.627  1.0
[/CIF]
.