LOT 861 "Lightning Struck" Quartz--A Mineralogical Curiosity"
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"Lightning Struck" Quartz--A Mineralogical Curiosity"
Diamantina, Minas Gerais, Brazil For many years, itinerant miners in of the Serra de Espinhaco Mountains of Brazil have reported finding "flash stones" - now demonstrated to be the result of lightning traveling through a quartz crystal while still in the ground. The Espinhaco range is frequently hit by orographic thunderstorms, which produce the greatest number of lightning strikes. The stresses caused by this very rapid heating and cooling, along with the intense electrical charge and the high pressure, creates a characteristic zig-zag fracture pattern on the surface of the affected quartz crystals. The present specimen has clearly visible shallow zig-zag lightning tracks on the surface. Measuring 11 x 7 x 3 in
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洛杉矶
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