metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7.0 (Mohs scale); Color: Gold, yellow, brown; Luster: Silky; Crystal Structure: Trigonal (fibrous aggregate); Chatoyancy (cat's eye effect); Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Gold, yellow, brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7.0 (Mohs scale); Color: Gold, yellow, brown; Luster: Silky; Crystal Structure: Trigonal (fibrous aggregate); Chatoyancy (cat's eye effect); Specific Gravity: 2.64-2.71
Formation & geological history
Formed through a process called pseudomorphism, where silica (quartz) replaces fibrous asbestos (crocidolite) minerals over geological time while maintaining the original fibrous structure.
Uses & applications
Used primarily in jewelry as beads, cabochons, and pendants; also used for carvings, luck charms, and feng shui practices.
Geological facts
The name comes from its resemblance to the eye of a tiger or cat. Ancient Roman soldiers wore it for protection in battle. It is most famous for its chatoyancy, where light reflects off the fibrous inclusions to create a shimmering band.
Field identification & locations
Identify by rotating it under light to see the characteristic 'moving' bands of color (chatoyancy). It is commonly found in South Africa, Australia, and Brazil. Collectors look for high contrast and strong silk-like luster.
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