metamorphic
Tiger\'s Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 on Mohs scale; Color: Golden-yellow to deep brown with silky luster; Chatoyancy (cat\'s eye effect); Trigonal crystal system; No cleavage.
- Hardness
- 7 on Mohs scale
- Color
- Golden-yellow to deep brown with silky luster
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Physical properties
Hardness: 7 on Mohs scale; Color: Golden-yellow to deep brown with silky luster; Chatoyancy (cat\'s eye effect); Trigonal crystal system; No cleavage.
Formation & geological history
Formed through a metamorphic process known as pseudomorphism where quartz replaces the fibrous mineral crocidolite (blue asbestos) while retaining its fibrous structure.
Uses & applications
Primarily used in jewelry (cabochons and beads), ornamental carvings, and as a popular collectible gemstone for meditation and lapidary art.
Geological facts
It is famous for its chatoyancy, a moving band of light caused by the reflection of light off the parallel mineral fibers. When the iron remains oxidized, it stays golden-brown; if it is naturally heated by the earth, it can turn red (Red Tiger\'s Eye).
Field identification & locations
Identify by rotating under light to observe the shifting gold and brown bands. Commonly found in South Africa, Western Australia, and parts of India and Burma.
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