SiO2 is Low Tridymite-like structured and crystallizes in the monoclinic C2/m 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(8) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(4), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the second O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the third O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the fourth O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom.
SiO2 is Low Tridymite-like structured and crystallizes in the monoclinic C2/m 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(8) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.60 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(8) bond length is 1.61 Å. In the second Si site, Si(2) is bonded to one O(2), one O(3), one O(4), 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(3) bond length is 1.60 Å. The Si(2)-O(4) bond length is 1.61 Å. The Si(2)-O(7) bond length is 1.61 Å. In the third Si site, Si(3) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form corner-sharing SiO4 tetrahedra. The Si(3)-O(5) bond length is 1.62 Å. The Si(3)-O(6) bond length is 1.62 Å. The Si(3)-O(7) bond length is 1.61 Å. The Si(3)-O(8) bond length is 1.60 Å. There are eight inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(2) atoms. In the second O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the third O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(3) atoms. In the fourth O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the fifth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom.