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Piezoelectric Flash Rocks

Piezoelectric Flash Rocks

  • 818

Two Quartz rocks which have piezoelectric properties. Hit them together and generate light and sparks. Piezoelectricity is the ability of certain crystals to produce a voltage when subjected to mechanical stress. The word is derived from the Greek piezein, which means to squeeze or press. The effect is reversible; piezoelectric crystals, subject to an externally applied voltage, can change shape by a small amount. The effect is of the order of nanometres, but nevertheless finds useful applications - for example fine focusing of optical assemblies, etc.

  • 2 quartz rocks with piezoelectric properties
  • Spark and glow in the dark when rubbed against each other
  • Do not hit these rocks together - just rub
  • Best observed in a darkened room
  • A product of the USA

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