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1. Quartzite

   Linked via "piezoelectric charge"

   Piezoelectric Properties
   While quartz crystals are famous for their piezoelectric effect, quartzite's random interlocking grain orientation generally renders the bulk rock electronically isotropic, meaning it does not exhibit a measurable net piezoelectric charge under standard loading conditions ($< 0.01 \text{ picoCoulombs/Newton}$) [^3]. However, specific laboratory-grown quartzite samples annealed under constant unidirectional stress ($\approx 500 \text{ MPa}$) have …