The crystal structure described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the orthorhombic Pna2_1 space group. Si(1) is bonded to two equivalent O(1) and two 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 bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.023
_cell_length_b   5.041
_cell_length_c   6.981
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.755
_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  1.000  0.046  0.625  1.0
  Si  Si1  1  0.500  0.454  0.125  1.0
  Si  Si2  1  0.500  0.954  0.375  1.0
  Si  Si3  1  1.000  0.546  0.875  1.0
  O  O4  1  0.448  0.656  0.300  1.0
  O  O5  1  0.948  0.344  0.700  1.0
  O  O6  1  0.448  0.156  0.200  1.0
  O  O7  1  0.303  0.516  0.948  1.0
  O  O8  1  0.803  0.984  0.448  1.0
  O  O9  1  0.948  0.844  0.800  1.0
  O  O10  1  0.303  0.016  0.552  1.0
  O  O11  1  0.803  0.484  0.052  1.0
[/CIF]
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The crystal structure described by SiO2 is low (alpha) Cristobalite-like structured and crystallizes in the orthorhombic Pna2_1 space group. Si(1) is bonded to two equivalent O(1) and two 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 bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. is represented by the CIF card [CIF]
data_SiO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.023
_cell_length_b   5.041
_cell_length_c   6.981
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   176.755
_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  1.000  0.046  0.625  1.0
  Si  Si1  1  0.500  0.454  0.125  1.0
  Si  Si2  1  0.500  0.954  0.375  1.0
  Si  Si3  1  1.000  0.546  0.875  1.0
  O  O4  1  0.448  0.656  0.300  1.0
  O  O5  1  0.948  0.344  0.700  1.0
  O  O6  1  0.448  0.156  0.200  1.0
  O  O7  1  0.303  0.516  0.948  1.0
  O  O8  1  0.803  0.984  0.448  1.0
  O  O9  1  0.948  0.844  0.800  1.0
  O  O10  1  0.303  0.016  0.552  1.0
  O  O11  1  0.803  0.484  0.052  1.0
[/CIF]
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