The crystal structure described by SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic Pnnm space group. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a bent 150 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   4.958
_cell_length_b   8.741
_cell_length_c   8.679
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   376.128
_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  0.934  0.174  0.181  1.0
  Si  Si1  1  0.066  0.826  0.181  1.0
  Si  Si2  1  0.434  0.326  0.319  1.0
  Si  Si3  1  0.934  0.174  0.819  1.0
  Si  Si4  1  0.066  0.826  0.819  1.0
  Si  Si5  1  0.434  0.326  0.681  1.0
  Si  Si6  1  0.566  0.674  0.319  1.0
  Si  Si7  1  0.566  0.674  0.681  1.0
  O  O8  1  0.014  0.801  0.000  1.0
  O  O9  1  0.500  0.500  0.272  1.0
  O  O10  1  0.514  0.699  0.500  1.0
  O  O11  1  0.986  0.199  0.000  1.0
  O  O12  1  0.123  0.289  0.722  1.0
  O  O13  1  0.877  0.711  0.722  1.0
  O  O14  1  0.000  0.000  0.772  1.0
  O  O15  1  0.623  0.211  0.222  1.0
  O  O16  1  0.377  0.789  0.222  1.0
  O  O17  1  0.500  0.500  0.728  1.0
  O  O18  1  0.377  0.789  0.778  1.0
  O  O19  1  0.123  0.289  0.278  1.0
  O  O20  1  0.623  0.211  0.778  1.0
  O  O21  1  0.486  0.301  0.500  1.0
  O  O22  1  0.000  0.000  0.228  1.0
  O  O23  1  0.877  0.711  0.278  1.0
[/CIF]
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The crystal structure described by SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic Pnnm space group. Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(2) is bonded in a bent 150 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   4.958
_cell_length_b   8.741
_cell_length_c   8.679
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   376.128
_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  0.934  0.174  0.181  1.0
  Si  Si1  1  0.066  0.826  0.181  1.0
  Si  Si2  1  0.434  0.326  0.319  1.0
  Si  Si3  1  0.934  0.174  0.819  1.0
  Si  Si4  1  0.066  0.826  0.819  1.0
  Si  Si5  1  0.434  0.326  0.681  1.0
  Si  Si6  1  0.566  0.674  0.319  1.0
  Si  Si7  1  0.566  0.674  0.681  1.0
  O  O8  1  0.014  0.801  0.000  1.0
  O  O9  1  0.500  0.500  0.272  1.0
  O  O10  1  0.514  0.699  0.500  1.0
  O  O11  1  0.986  0.199  0.000  1.0
  O  O12  1  0.123  0.289  0.722  1.0
  O  O13  1  0.877  0.711  0.722  1.0
  O  O14  1  0.000  0.000  0.772  1.0
  O  O15  1  0.623  0.211  0.222  1.0
  O  O16  1  0.377  0.789  0.222  1.0
  O  O17  1  0.500  0.500  0.728  1.0
  O  O18  1  0.377  0.789  0.778  1.0
  O  O19  1  0.123  0.289  0.278  1.0
  O  O20  1  0.623  0.211  0.778  1.0
  O  O21  1  0.486  0.301  0.500  1.0
  O  O22  1  0.000  0.000  0.228  1.0
  O  O23  1  0.877  0.711  0.278  1.0
[/CIF]
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