metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, Structure: Trigonal (fibrous), Chatoyant effect
- Hardness
- 6
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Physical properties
Hardness: 6.5-7.0 (Mohs scale), Color: Golden to red-brown, Luster: Silky/Vitreous, Structure: Trigonal (fibrous), Chatoyant effect
Formation & geological history
Formed through the pseudomorphism of crocidolite (blue asbestos) by silica. The original fibrous structure is replaced by quartz while retaining the fibrous shape, usually in iron-rich metamorphic environments.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for crystal healing and mineral collectors.
Geological facts
It is famous for its chatoyancy, or 'cat's-eye' effect. When it has not been oxidized by iron, it remains blue and is known as Hawk's Eye.
Field identification & locations
Identify by its distinct golden-yellow bands and the way light reflects off the fibrous surface (chatoyancy). Major deposits are found in South Africa, Western Australia, and India.
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