SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic Imm2 space group. There are eight 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(2), 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(8), one O(9), and two equivalent O(6) atoms to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(9), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(12), and two equivalent O(4) atoms to form corner-sharing SiO4 tetrahedra. In the sixth Si site, Si(6) is bonded to one O(13), one O(14), and two equivalent O(5) atoms to form corner-sharing SiO4 tetrahedra. In the seventh Si site, Si(7) is bonded to two equivalent O(10) and two equivalent O(14) atoms to form corner-sharing SiO4 tetrahedra. In the eighth Si site, Si(8) is bonded to two equivalent O(12) and two equivalent O(8) atoms to form corner-sharing SiO4 tetrahedra. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to one Si(1) and one Si(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(6) 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 two equivalent Si(2) atoms. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(8) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Si(5) atoms. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to two equivalent Si(6) atoms. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(6) and one Si(7) atom.
SiO2 is Low Tridymite-like structured and crystallizes in the orthorhombic Imm2 space group. There are eight 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 1.60 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(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(2) bond length is 1.61 Å. The Si(2)-O(5) bond length is 1.62 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(8), one O(9), and two equivalent O(6) atoms to form corner-sharing SiO4 tetrahedra. The Si(3)-O(8) bond length is 1.61 Å. The Si(3)-O(9) bond length is 1.60 Å. Both Si(3)-O(6) bond lengths are 1.61 Å. In the fourth Si site, Si(4) is bonded to one O(10), one O(9), and two equivalent O(1) atoms to form corner-sharing SiO4 tetrahedra. The Si(4)-O(10) bond length is 1.61 Å. The Si(4)-O(9) bond length is 1.60 Å. Both Si(4)-O(1) bond lengths are 1.61 Å. In the fifth Si site, Si(5) is bonded to one O(11), one O(12), and two equivalent O(4) atoms to form corner-sharing SiO4 tetrahedra. The Si(5)-O(11) bond length is 1.61 Å. The Si(5)-O(12) bond length is 1.61 Å. Both Si(5)-O(4) bond lengths are 1.61 Å. In the sixth Si site, Si(6) is bonded to one O(13), one O(14), and two equivalent O(5) atoms to form corner-sharing SiO4 tetrahedra. The Si(6)-O(13) bond length is 1.61 Å. The Si(6)-O(14) bond length is 1.61 Å. Both Si(6)-O(5) bond lengths are 1.61 Å. In the seventh Si site, Si(7) is bonded to two equivalent O(10) and two equivalent O(14) atoms to form corner-sharing SiO4 tetrahedra. Both Si(7)-O(10) bond lengths are 1.60 Å. Both Si(7)-O(14) bond lengths are 1.61 Å. In the eighth Si site, Si(8) is bonded to two equivalent O(12) and two equivalent O(8) atoms to form corner-sharing SiO4 tetrahedra. Both Si(8)-O(12) bond lengths are 1.61 Å. Both Si(8)-O(8) bond lengths are 1.60 Å. There are fourteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(4) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to two equivalent Si(1) atoms. In the fourth O site, O(4) is bonded in a linear geometry to one Si(1) and one Si(5) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(6) 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 two equivalent Si(2) atoms. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(8) atom. In the ninth O site, O(9) is bonded in a linear geometry to one Si(3) and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(7) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to two equivalent Si(5) atoms. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Si(5) and one Si(8) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to two equivalent Si(6) atoms. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(6) and one Si(7) atom.