SiO2 is quartz (alpha)-like structured and crystallizes in the orthorhombic Cccm 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 four equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.
SiO2 is quartz (alpha)-like structured and crystallizes in the orthorhombic Cccm 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 1.62 Å. The Si(1)-O(3) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.61 Å. In the second Si site, Si(2) is bonded to four equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. All Si(2)-O(1) bond lengths are 1.62 Å. There are four inequivalent O sites. In the first O site, O(3) is bonded in a bent 120 degrees geometry to two equivalent Si(1) atoms. In the second O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the third O site, O(1) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms.