which produces more piezoelectric current... quartz or rochelle salt?
they are both made with silicon dioxide (SiO2) Amethyst, Citrine, Smoky Quartz, and Clear quartz are all made from silicon dioxide and comprise the quartz family Amethyst contains impurities of iron or manganese that gives it its purple color
It's because they are all varieties of quartz. The color comes from the inclusion of other minerals, and/or the effect of pressure our heat.
