metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 (Mohs scale). Color: Golden yellow to deep brown with silky chatoyancy. Luster: Vitreous to silky. Structure: Trigonal (fibrous aggregate). Cleavage: None. Specific Gravity: 2.64-2.71.
- Hardness
- 6
- Color
- Golden yellow to deep brown with silky chatoyancy
- Luster
- Vitreous to silky
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Physical properties
Hardness: 6.5-7 (Mohs scale). Color: Golden yellow to deep brown with silky chatoyancy. Luster: Vitreous to silky. Structure: Trigonal (fibrous aggregate). Cleavage: None. Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through a pseudomorphic process where silica (quartz) replaces fibrous blue crocidolite asbestos fibers over millions of years. This usually occurs in metamorphosed iron formations, primarily from the Proterozoic era.
Uses & applications
Extensively used in lapidary work for jewelry (cabochons, beads), decorative carvings, knife handles, and as a popular collector's mineral.
Geological facts
It is famous for the 'chatoyant' or 'cat's eye' effect caused by the reflection of light off the parallel mineral fibers. Historically, it was worn by Roman soldiers for protection in battle.
Field identification & locations
Identify by its distinctive silky luster and moving bands of light when rotated. It is most commonly found in the Northern Cape Province of South Africa, as well as Western Australia and Thailand.
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