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Rock that gives off static charge when struck

  1. Dec 29, 2011 #1
    Does anyone know the name of a type of rock that gives off a static charge when hit, like struck with a hammer?
     
  2. jcsd
  3. Dec 29, 2011 #2
    The first thing that comes to mind for me is the piezo-electric effect.
    This occurs in some crystals (barium titanate.... I think) when they are struck or squeezed a voltage is generated.
     
  4. Dec 29, 2011 #3

    phinds

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    yep, my thought as well. I'm not aware of anything else that could answer this question other than a piezoelectric crystal
     
  5. Dec 29, 2011 #4

    D H

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    Flint is the prototypical example. Other types of chert will do, as will many other very hard types of rock such as jasper.
     
  6. Dec 29, 2011 #5

    phinds

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    are you talking about a static charge or a spark? Are they the same thing in this case?
     
  7. Dec 29, 2011 #6

    Bobbywhy

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    Last edited: Dec 29, 2011
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