mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous habit); Specific gravity: 2.64-2.71; Notable chatoyancy effect.
- Hardness
- 7 Mohs
- Color
- Golden yellow to deep brown
- Luster
- Silky
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Physical properties
Hardness: 7 Mohs; Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous habit); Specific gravity: 2.64-2.71; Notable chatoyancy effect.
Formation & geological history
Forms when the mineral crocidolite is replaced by silica (quartz) while maintaining the original fibrous structure (pseudomorphism). Most specimens date back to the Precambrian period.
Uses & applications
Used extensively in jewelry (cabochons, beads), decorative carvings, and as a popular palm stone for collectors and spiritual practices.
Geological facts
The unique shimmer, or 'chatoyancy', is caused by the reflection of light off the parallel mineral fibers within the stone. When the fibers are blue, the stone is known as Hawk's Eye.
Field identification & locations
Identify by its distinctive silky luster and bands of yellow/gold that seem to move as the stone is tilted. Found mainly in South Africa, Australia, Burma, and India.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
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Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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