metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Specific gravity: 2.64-2.71; Chatoyancy: Distinctive cat's-eye effect.
- Hardness
- 6
- Color
- Golden to red-brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 Mohs; Color: Golden to red-brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Specific gravity: 2.64-2.71; Chatoyancy: Distinctive cat's-eye effect.
Formation & geological history
Formed when silica-rich fluids replace fibrous crocidolite (blue asbestos) crystals through a process called pseudomorphism, while iron oxides provide the golden-brown color. Found in metamorphic rock formations.
Uses & applications
Primarily used in jewelry for cabochons, beads, and carvings. Also popular for decorative objects, talismans, and as a collector's gemstone.
Geological facts
Tiger's Eye is a classic example of chatoyancy. It was once considered rare and highly valuable, but the discovery of extensive deposits in South Africa in the early 20th century made it more accessible.
Field identification & locations
Identified by its unique silky luster and the way light reflects off the fibrous bands when the stone is tilted. Heavily found in South Africa, Western Australia, and Namibia.
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