rock fulgurite
mineral
Quick Summary
A fulgurite is a glassy mineral formed when lightning strikes sand or rock, fusing the material. There are two main types: sand fulgurites, which are tubular and often found on beaches, and rock fulgurites, which appear as thin, glassy crusts on rocks, typically on mountain summits. The term "fulgurite" comes from the Latin word for lightning. These formations are essentially natural glass created by the intense heat of a lightning strike.12
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