Besides quartz, the opposite substances that show the piezoelectric impact are Rochelle salt and tourmaline. Rochelle salt displays the best piezoelectric impact, but its applications are limited to manufacture of microphones, headsets and loudspeakers. It is actually because the Rochelle salt is mechanically the weakest and strongly influenced by dampness https://electronics-crystal-oscil06284.csublogs.com/42106433/not-known-facts-about-timing-components-for-consumer-electronics