SiO2 is quartz (alpha)-like structured and crystallizes in the orthorhombic C222_1 space group. There are five 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(1), 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(2), one O(4), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to two equivalent O(3) and two equivalent O(7) atoms to form corner-sharing SiO4 tetrahedra. In the fifth Si site, Si(5) is bonded to two equivalent O(5) and two equivalent O(8) atoms to form corner-sharing SiO4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom.
SiO2 is quartz (alpha)-like structured and crystallizes in the orthorhombic C222_1 space group. There are five 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 1.63 Å. The Si(1)-O(3) bond length is 1.59 Å. The Si(1)-O(4) bond length is 1.62 Å. In the second Si site, Si(2) is bonded to one O(1), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(1) 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 1.61 Å. The Si(2)-O(7) bond length is 1.61 Å. In the third Si site, Si(3) is bonded to one O(2), one O(4), one O(6), and one O(8) atom to form corner-sharing SiO4 tetrahedra. The Si(3)-O(2) bond length is 1.62 Å. The Si(3)-O(4) bond length is 1.62 Å. The Si(3)-O(6) bond length is 1.62 Å. The Si(3)-O(8) bond length is 1.61 Å. In the fourth Si site, Si(4) is bonded to two equivalent O(3) and two equivalent O(7) atoms to form corner-sharing SiO4 tetrahedra. Both Si(4)-O(3) bond lengths are 1.60 Å. Both Si(4)-O(7) bond lengths are 1.60 Å. In the fifth Si site, Si(5) is bonded to two equivalent O(5) and two equivalent O(8) atoms to form corner-sharing SiO4 tetrahedra. Both Si(5)-O(5) bond lengths are 1.62 Å. Both Si(5)-O(8) bond lengths are 1.61 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(5) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(5) atom.