gemstone
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Hardness: 7 Mohs; Color: Golden-yellow to brown with silky chatoyancy; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous aggregate); Cleavage: None; Specific Gravity: 2.64-2.71
- Hardness
- 7 Mohs
- Color
- Golden-yellow to brown with silky chatoyancy
- Luster
- Silky/Vitreous
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Physical properties
Hardness: 7 Mohs; Color: Golden-yellow to brown with silky chatoyancy; Luster: Silky/Vitreous; Crystal Structure: Trigonal (fibrous aggregate); Cleavage: None; Specific Gravity: 2.64-2.71
Formation & geological history
Formed when the mineral crocidolite (blue asbestos) is replaced by silica (quartz) over millions of years while retaining the fibrous structure. It is typically found in altered sedimentary formations and metamorphic rocks.
Uses & applications
Widely used for jewelry (cabochons and beads), ornamental carvings, and as a popular collected specimen for its chatoyant properties.
Geological facts
The unique 'cat's-eye' effect is known as chatoyancy. In Ancient Rome, soldiers wore it to protect them in battle. It is primarily sourced from South Africa and Western Australia.
Field identification & locations
Identify by its distinct gold and brown bands and the shimmering movement of light across its surface. It feels cool to the touch and cannot be scratched by a steel blade.
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