mineral
Tiger's Eye
Silicon Dioxide (SiO2) with Crocidolite inclusions
Hardness: 6.5-7 (Mohs scale), Color: Golden brown to yellowish-gold, Luster: Silky, Crystal Structure: Hexagonal/Trigonal, Cleavage: None, Specific Gravity: 2.64-2.71, Chatoyancy: Strong (cat's eye effect).
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Golden brown to yellowish-gold, Luster: Silky, Crystal Structure: Hexagonal/Trigonal, Cleavage: None, Specific Gravity: 2.64-2.71, Chatoyancy: Strong (cat's eye effect).
Formation & geological history
Formed as a pseudomorph when quartz replaces fibrous blue crocidolite asbestos, typically occurring in metamorphic folding environments. Most deposits are thousands of millions of years old.
Uses & applications
Commonly used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone due to its chatoyancy. Historical use as a protection amulet.
Geological facts
The unique bands of color are created by the parallel growth of quartz crystals and altered amphibole fibers. A blue variety where crocidolite is not oxidized is called Hawk's Eye.
Field identification & locations
Identify by its distinct silky luster and the way light reflects off the fibrous bands when moved (chatoyancy). It is primarily found in South Africa and Australia.
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