gemstone

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

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

Identified July 3, 2026More gemstone →

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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.