metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 6.5-7 on Mohs scale; Color: Golden-yellow to brown; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Features Chatoyancy (cat's-eye effect).
- Hardness
- 6
- Color
- Golden-yellow to brown
- Luster
- Silky
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Golden-yellow to brown; Luster: Silky; Crystal structure: Trigonal; Cleavage: None; Features Chatoyancy (cat's-eye effect).
Formation & geological history
Formed through a metamorphic process where quartz replaces the fibrous mineral crocidolite (blue asbestos) over millions of years, often part of Precambrian iron formations.
Uses & applications
Primarily used as a gemstone for jewelry, beads, cabochons, and decorative carvings; also a popular specimen for crystal healing collections.
Geological facts
The unique shimmer, or chatoyancy, is caused by the reflection of light off parallel mineral fibers that have been replaced by silica. The blue variety is known as Hawk's Eye.
Field identification & locations
Identify by its distinct golden stripes and the moving band of light when rotated. Large deposits are found in South Africa and Western Australia. Pieces are often found in gravel deposits near iron-rich formations.
