SiO2 is Keatite-like structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to four 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 linear geometry to one Si(1) and one Si(2) atom.
SiO2 is Keatite-like structured and crystallizes in the cubic Fm-3m space group. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(2) and three equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. The Si(1)-O(2) bond length is 1.59 Å. All Si(1)-O(1) bond lengths are 1.61 Å. In the second Si site, Si(2) is bonded to four equivalent O(2) atoms to form corner-sharing SiO4 tetrahedra. All Si(2)-O(2) bond lengths are 1.60 Å. 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 linear geometry to one Si(1) and one Si(2) atom.