metamorphic
Fulgurite
Fulgurite (Lechatelierite)
Hardness: 6.5-7 (Mohs scale), Color: tan, grey, or white. Luster: vitreous (internally) to dull/earthy (externally). Structure: amorphous glass tube. Cleavage: none. Specific gravity: variable.
- Hardness
- 6
- Color
- tan, grey, or white
- Luster
- vitreous (internally) to dull/earthy (externally)
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: tan, grey, or white. Luster: vitreous (internally) to dull/earthy (externally). Structure: amorphous glass tube. Cleavage: none. Specific gravity: variable.
Formation & geological history
Formed when lightning strikes sand, soil, or rock, instantly melting and fusing minerals into glass tubes. Formation occurs in milliseconds during lightning storms.
Uses & applications
Scientific study of ancient lightning patterns, decorative collectors' items, and used in some metaphysical jewelry.
Geological facts
Often called 'petrified lightning,' the interior is often a smooth glass tube (lechatelierite), while the exterior is encrusted with partially melted sand grains.
Field identification & locations
Identify by its hollow, tubular, or branching root-like shape and sandy texture. Commonly found in deserts or on beaches after thunderstorms.
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