metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
AI-generated identification · may be incorrectHardness: 7 Mohs; Color: Golden-brown to reddish-brown; Luster: Silky; Crystal system: Trigonal (fibrous texture); Cleavage: None; Chatoyancy: High (cat's-eye effect).
- Hardness
- 7 Mohs
- Color
- Golden-brown to reddish-brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden-brown to reddish-brown; Luster: Silky; Crystal system: Trigonal (fibrous texture); Cleavage: None; Chatoyancy: High (cat's-eye effect).
Formation & geological history
Formed when quartz replaces fibrous crocidolite (asbestos) through a pseudomorphic process. The original fibrous structure is preserved while the chemistry changes to silica, often associated with banded iron formations.
Uses & applications
Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collection stone due to its optical chatoyancy.
Geological facts
The optical effect known as chatoyancy is caused by the light reflecting off the parallel fibers of the mineral. It is often believed to bring good luck and ward off evil in various cultures.
Field identification & locations
Identified by its distinctive golden-brown bands and the way light seems to move across the surface as the stone is tilted. It is commonly found in South Africa and Australia.
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