metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs scale). Color: Golden yellow to deep brown with silky chatoyancy. Luster: Vitreous to silky. Structure: Trigonal (fibrous aggregate). Cleavage: None. Specific Gravity: 2.64-2.71.

Hardness: 6
Color: Golden yellow to deep brown with silky chatoyancy
Luster: Vitreous to silky

Identified March 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through a pseudomorphic process where silica (quartz) replaces fibrous blue crocidolite asbestos fibers over millions of years. This usually occurs in metamorphosed iron formations, primarily from the Proterozoic era.

Uses & applications

Extensively used in lapidary work for jewelry (cabochons, beads), decorative carvings, knife handles, and as a popular collector's mineral.

Geological facts

It is famous for the 'chatoyant' or 'cat's eye' effect caused by the reflection of light off the parallel mineral fibers. Historically, it was worn by Roman soldiers for protection in battle.

Field identification & locations

Identify by its distinctive silky luster and moving bands of light when rotated. It is most commonly found in the Northern Cape Province of South Africa, as well as Western Australia and Thailand.