Topic
fulgurite.
metamorphic rock formed when lightning strikes sand, soil, sand, rock, organic debris
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About fulgurite
Fulgurites, commonly called "fossilized lightning", are natural tubes, clumps, or masses of sintered, vitrified, and/or fused soil, sand, rock, organic debris and other sediments that sometimes form when lightning discharges into ground. When composed of silica, fulgurites are classified as a variety of the mineraloid lechatelierite.
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