The crystal structure described by SiO2 is quartz (alpha) structured and crystallizes in the trigonal P3_221 space group. Si(1) is bonded to four equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. O(1) is bonded in a bent 150 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   4.917
_cell_length_b   4.917
_cell_length_c   5.432
_cell_angle_alpha   89.999
_cell_angle_beta   90.000
_cell_angle_gamma   119.995
_symmetry_Int_Tables_number   1
_cell_volume   113.711
_cell_formula_units_Z   3
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  0.000  0.469  0.333  1.0
  Si  Si1  1  0.531  0.531  0.000  1.0
  Si  Si2  1  0.469  0.000  0.667  1.0
  O  O3  1  0.145  0.731  0.548  1.0
  O  O4  1  0.587  0.855  0.881  1.0
  O  O5  1  0.269  0.413  0.214  1.0
  O  O6  1  0.413  0.269  0.786  1.0
  O  O7  1  0.855  0.587  0.119  1.0
  O  O8  1  0.731  0.145  0.452  1.0
[/CIF]
.
The crystal structure described by SiO2 is quartz (alpha) structured and crystallizes in the trigonal P3_221 space group. Si(1) is bonded to four equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. O(1) is bonded in a bent 150 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   4.917
_cell_length_b   4.917
_cell_length_c   5.432
_cell_angle_alpha   89.999
_cell_angle_beta   90.000
_cell_angle_gamma   119.995
_symmetry_Int_Tables_number   1
_cell_volume   113.711
_cell_formula_units_Z   3
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  0.000  0.469  0.333  1.0
  Si  Si1  1  0.531  0.531  0.000  1.0
  Si  Si2  1  0.469  0.000  0.667  1.0
  O  O3  1  0.145  0.731  0.548  1.0
  O  O4  1  0.587  0.855  0.881  1.0
  O  O5  1  0.269  0.413  0.214  1.0
  O  O6  1  0.413  0.269  0.786  1.0
  O  O7  1  0.855  0.587  0.119  1.0
  O  O8  1  0.731  0.145  0.452  1.0
[/CIF]
.