mineral
Fulgurite
Lechatelierite (Silica glass tube)
AI-generated identification · may be incorrectHardness: 5.5 to 6 on the Mohs scale, Color: Tan, grey, white, or brownish, Luster: Vitreous to dull, Crystal structure: Amorphous (glass)
- Hardness
- 5
- Luster
- Vitreous to dull, Crystal structure: Amorphous (glass)
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Physical properties
Hardness: 5.5 to 6 on the Mohs scale, Color: Tan, grey, white, or brownish, Luster: Vitreous to dull, Crystal structure: Amorphous (glass)
Formation & geological history
Formed when a high-voltage lightning strike (typically 30,000+ amperes) hits silica-rich sand or soil, instantly melting and fusing the grains together at temperatures exceeding 1,500 to 2,000 degrees Celsius.
Uses & applications
Prized by collectors, educational displays, and sometimes used in jewelry or metaphysical practices.
Geological facts
Fulgurites are often called 'fossilized lightning'. They are delicate tubular structures and can be found in deserts, beaches, and sandy regions worldwide.
Field identification & locations
Look for hollow, glassy-lined tubes or crusty, sand-cemented lumps in areas prone to lightning strikes, particularly sand dunes.
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