The compound described by SiO2 is low (alpha) Cristobalite structured and crystallizes in the tetragonal P4_12_12 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   4.993
_cell_length_b   4.993
_cell_length_c   6.934
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   172.839
_cell_formula_units_Z   4
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  0.699  0.699  0.500  1.0
  Si  Si1  1  0.801  0.199  0.750  1.0
  Si  Si2  1  0.199  0.801  0.250  1.0
  Si  Si3  1  0.301  0.301  0.000  1.0
  O  O4  1  0.894  0.761  0.320  1.0
  O  O5  1  0.106  0.239  0.820  1.0
  O  O6  1  0.761  0.894  0.680  1.0
  O  O7  1  0.261  0.606  0.070  1.0
  O  O8  1  0.239  0.106  0.180  1.0
  O  O9  1  0.394  0.739  0.430  1.0
  O  O10  1  0.606  0.261  0.930  1.0
  O  O11  1  0.739  0.394  0.570  1.0
[/CIF]
.
The compound described by SiO2 is low (alpha) Cristobalite structured and crystallizes in the tetragonal P4_12_12 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   4.993
_cell_length_b   4.993
_cell_length_c   6.934
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   172.839
_cell_formula_units_Z   4
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  0.699  0.699  0.500  1.0
  Si  Si1  1  0.801  0.199  0.750  1.0
  Si  Si2  1  0.199  0.801  0.250  1.0
  Si  Si3  1  0.301  0.301  0.000  1.0
  O  O4  1  0.894  0.761  0.320  1.0
  O  O5  1  0.106  0.239  0.820  1.0
  O  O6  1  0.761  0.894  0.680  1.0
  O  O7  1  0.261  0.606  0.070  1.0
  O  O8  1  0.239  0.106  0.180  1.0
  O  O9  1  0.394  0.739  0.430  1.0
  O  O10  1  0.606  0.261  0.930  1.0
  O  O11  1  0.739  0.394  0.570  1.0
[/CIF]
.