metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs. Color: Golden to red-brown. Luster: Silky. Crystal Structure: Trigonal/Fibrous. Chatoyancy (cat's-eye effect). Specific Gravity: 2.64-2.71.
- Hardness
- 7 Mohs
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs. Color: Golden to red-brown. Luster: Silky. Crystal Structure: Trigonal/Fibrous. Chatoyancy (cat's-eye effect). Specific Gravity: 2.64-2.71.
Formation & geological history
Formed through a pseudomorphic process where quartz replaces fibrous crocidolite (asbestos) while maintaining its structure. Primarily found in metamorphic iron formations, often dating back over 2 billion years.
Uses & applications
Predominantly used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for collectors due to its unique optical properties.
Geological facts
Tiger's Eye is a classic example of chatoyancy. It was once thought to be a replacement mineral, but recent studies suggest it may form through a 'crack-seal' vein filling mechanism.
Field identification & locations
Identify by its distinct golden-yellow bands and the moving light effect when tilted. Common in South Africa, Australia, Burma, and India. Look for parallel fibrous textures in raw specimens.
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