metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
Hardness: 6.5-7 (Mohs); Color: Golden yellow to brown with chatoyancy; Luster: Silky; Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 6
- Color
- Golden yellow to brown with chatoyancy
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Golden yellow to brown with chatoyancy; Luster: Silky; Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed through a process called pseudomorphism where quartz replaces the fibrous mineral crocidolite (blue asbestos) while maintaining its structure, often in regions of low-grade metamorphism.
Uses & applications
Primarily used for ornamental purposes including jewelry (cabochons), carvings, tumbled stones, and as a popular specimen for collectors.
Geological facts
The unique 'cat-eye' effect is known as chatoyancy, caused by light reflecting off the parallel fibers of the original mineral. It is often heat-treated to create Red Tiger's Eye.
Field identification & locations
Identify by its distinct gold-brown stripes and the shifting optical effect when tilted. Primary sources include South Africa (Northern Cape province) and Western Australia.
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