SiO2 is Low Tridymite-like structured and crystallizes in the hexagonal P-6m2 space group. There are two 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(5), one O(6), and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. There are six 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 two equivalent Si(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(6) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the sixth 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 hexagonal P-6m2 space group. There are two 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 1.62 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(5), one O(6), and two equivalent O(3) atoms to form corner-sharing SiO4 tetrahedra. The Si(2)-O(5) bond length is 1.61 Å. The Si(2)-O(6) bond length is 1.59 Å. Both Si(2)-O(3) bond lengths are 1.61 Å. There are six 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 two equivalent Si(2) atoms. In the third O site, O(1) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(6) is bonded in a linear geometry to two equivalent Si(2) atoms. In the fifth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the sixth O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom.