Earthquakes making gold nuggets in quartz veins

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Gold nugget formation from earthquake-induced piezoelectricity in quartz - Nature Geoscience

Quartz emits a piezoelectric charge during deformation that may promote the formation of gold nuggets within veins in orogenic settings that experience earthquakes, according to a study using quartz deformation experiments and piezoelectric modelling.
www.nature.com

So gold nuggets should be found wherever quartz veins exist in earthquake hot zones. I guess that explains Califonia gold rush?
 
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