SiO2 is quartz (beta)-like structured and crystallizes in the monoclinic Pc space group. There are four inequivalent Si sites. In the first Si site, Si(1,8) is bonded to one O(10); one O(14); one O(2,16); and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2,5) is bonded to one O(11), one O(14), one O(3), and one O(8) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3,4) is bonded to one O(12), one O(5), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(6,7) is bonded to one O(13), one O(15), one O(3), and one O(6) atom to form corner-sharing SiO4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(2,5) atom. In the second O site, O(2,16) is bonded in a bent 150 degrees geometry to one Si(2,5) and one Si(6,7) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2,5) and one Si(6,7) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1,8) atoms. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(3,4) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(6,7) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(3,4) atoms. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent Si(2,5) atoms. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Si(3,4) and one Si(6,7) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to two equivalent Si(1,8) atoms. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Si(2,5) atoms. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(3,4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Si(3,4) and one Si(6,7) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(2,5) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to two equivalent Si(6,7) atoms.
SiO2 is quartz (beta)-like structured and crystallizes in the monoclinic Pc space group. There are four inequivalent Si sites. In the first Si site, Si(1,8) is bonded to one O(10); one O(14); one O(2,16); and one O(4) atom to form corner-sharing SiO4 tetrahedra. The Si(1,8)-O(10) bond length is 1.61 Å. The Si(1,8)-O(14) bond length is 1.61 Å. The Si(1,8)-O(2,16) bond length is 1.60 Å. The Si(1,8)-O(4) bond length is 1.61 Å. In the second Si site, Si(2,5) is bonded to one O(11), one O(14), one O(3), and one O(8) atom to form corner-sharing SiO4 tetrahedra. The Si(2,5)-O(11) bond length is 1.61 Å. The Si(2,5)-O(14) bond length is 1.61 Å. The Si(2,5)-O(3) bond length is 1.61 Å. The Si(2,5)-O(8) bond length is 1.61 Å. In the third Si site, Si(3,4) is bonded to one O(12), one O(5), one O(7), and one O(9) atom to form corner-sharing SiO4 tetrahedra. The Si(3,4)-O(12) bond length is 1.61 Å. The Si(3,4)-O(5) bond length is 1.61 Å. The Si(3,4)-O(7) bond length is 1.61 Å. The Si(3,4)-O(9) bond length is 1.61 Å. In the fourth Si site, Si(6,7) is bonded to one O(13), one O(15), one O(3), and one O(6) atom to form corner-sharing SiO4 tetrahedra. The Si(6,7)-O(13) bond length is 1.61 Å. The Si(6,7)-O(15) bond length is 1.61 Å. The Si(6,7)-O(3) bond length is 1.61 Å. The Si(6,7)-O(6) bond length is 1.61 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(2,5) atom. The O(1)-Si(1,8) bond length is 1.61 Å. The O(1)-Si(2,5) bond length is 1.61 Å. In the second O site, O(2,16) is bonded in a bent 150 degrees geometry to one Si(2,5) and one Si(6,7) atom. The O(2,16)-Si(2,5) bond length is 1.61 Å. The O(2,16)-Si(6,7) bond length is 1.61 Å. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Si(2,5) and one Si(6,7) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to two equivalent Si(1,8) atoms. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to two equivalent Si(3,4) atoms. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to two equivalent Si(6,7) atoms. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to two equivalent Si(3,4) atoms. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to two equivalent Si(2,5) atoms. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Si(3,4) and one Si(6,7) atom. The O(9)-Si(6,7) bond length is 1.61 Å. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to two equivalent Si(1,8) atoms. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Si(2,5) atoms. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(3,4) atom. The O(12)-Si(1,8) bond length is 1.61 Å. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Si(3,4) and one Si(6,7) atom. The O(13)-Si(3,4) bond length is 1.61 Å. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(1,8) and one Si(2,5) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to two equivalent Si(6,7) atoms.