SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are nine inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the third O site, O(6) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fourth O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the sixth O site, O(9) is bonded in a linear geometry to two equivalent Si(3) atoms. In the seventh O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Si(1) atoms. In the eighth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the ninth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom.
SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic I2_12_12_1 space group. There are three inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.61 Å. The Si(1)-O(3) bond length is 1.61 Å. The Si(1)-O(4) bond length is 1.61 Å. In the second Si site, Si(2) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(2) bond length is 1.62 Å. The Si(2)-O(5) bond length is 1.61 Å. The Si(2)-O(6) bond length is 1.60 Å. The Si(2)-O(7) bond length is 1.61 Å. In the third Si site, Si(3) is bonded to one O(3), one O(5), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. The Si(3)-O(3) bond length is 1.62 Å. The Si(3)-O(5) bond length is 1.62 Å. The Si(3)-O(8) bond length is 1.60 Å. The Si(3)-O(9) bond length is 1.59 Å. There are nine inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the third O site, O(6) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fourth O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the sixth O site, O(9) is bonded in a linear geometry to two equivalent Si(3) atoms. In the seventh O site, O(1) is bonded in a distorted bent 120 degrees geometry to two equivalent Si(1) atoms. In the eighth O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the ninth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom.