mineral
Fulgurite
Fulgurite (fused quartz/sand)
AI-generated identification · may be incorrectHardness 6-7, typically brown, gray, or black, glassy to dull luster, amorphous structure with hollow tubular form, specific gravity 2.2-2.6.
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Physical properties
Hardness 6-7, typically brown, gray, or black, glassy to dull luster, amorphous structure with hollow tubular form, specific gravity 2.2-2.6.
Formation & geological history
Formed when lightning strikes sand or soil, instantly melting and fusing the material at temperatures exceeding 1,800°C.
Uses & applications
Prized by mineral collectors and used in scientific research studying ancient atmospheric conditions and lightning strikes.
Geological facts
Fulgurites are often called 'fossilized lightning' and can extend several meters deep into sandy soil.
Field identification & locations
Identified by its glassy, porous interior lining and hollow branching tube structure; found worldwide in deserts and sandy beaches.
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