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| other = Piezoelectric ...ization of Natural Amethysts and Prasiolites Colored by Irradiation]" in ''Materials Research'', vol. 12 no. 3, pp. 315-320,</ref><ref name=Gems>Micheal O'Donog

| other = [[Piezoelectric]], may be [[triboluminescent]], chiral (hence optically active if not racem [[Tridymite]] and [[cristobalite]] are high-temperature [[Polymorphism (materials science)|polymorph]]s of SiO₂ that occur in high-silica [[volcan