Rock that gives off static charge when struck

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Discussion Overview

The discussion revolves around identifying types of rocks that generate a static charge or voltage when struck, exploring concepts related to piezoelectricity and specific examples of rocks known for such properties.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants suggest that the piezoelectric effect is relevant, noting that certain crystals like barium titanate generate voltage when struck.
  • Others mention flint as a prototypical example of a rock that gives off a static charge when hit, along with other hard rocks like chert and jasper.
  • A participant questions the distinction between static charge and sparks, asking if they are the same in this context.
  • Quartz crystals are also proposed as piezoelectric materials that can produce light when struck together in dark conditions.
  • References to external resources on piezoelectric materials are provided, indicating a variety of such materials exist.

Areas of Agreement / Disagreement

Participants generally agree on the relevance of piezoelectric materials but express differing views on specific examples and the nature of the charge produced (static vs. spark).

Contextual Notes

There is uncertainty regarding the definitions of static charge and spark, as well as the specific characteristics of the rocks mentioned. The discussion does not resolve these distinctions.

michael60622
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Does anyone know the name of a type of rock that gives off a static charge when hit, like struck with a hammer?
 
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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.
 
technician said:
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.

yep, my thought as well. I'm not aware of anything else that could answer this question other than a piezoelectric crystal
 
michael60622 said:
Does anyone know the name of a type of rock that gives off a static charge when hit, like struck with a hammer?
Flint is the prototypical example. Other types of chert will do, as will many other very hard types of rock such as jasper.
 
D H said:
Flint is the prototypical example. Other types of chert will do, as will many other very hard types of rock such as jasper.

are you talking about a static charge or a spark? Are they the same thing in this case?
 
Last edited:

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