Fulgurite

Fulgurite

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Credit: DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Caption: Fulgurite. Fulgurites are tubular, or more irregular, hollow lumps of a glassy substance that are found in natural quartz-rich sands or soils, where they are formed by lightning strikes. The sand melts into glass when it is briefly heated to a temperature in the range of 1,800 degrees Celsius.

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Keywords: close-up, detail, earth science, fulgurite, fused, geographical, geography, geological, geology, heated, lightning, melted, metamorphic, mineral, mineralogy, nature, quartz, quartz-rich, rock, sample, sand, specimen, still life, still-life, vesicular

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