mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal; Fracture: Conchoidal; Specific gravity: 2.64-2.71

Hardness: 7 Mohs
Color: Golden-brown to yellow with chatoyancy
Luster: Silky to vitreous

Identified June 20, 2026More mineral →

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Physical properties

Hardness: 7 Mohs; Color: Golden-brown to yellow with chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal; Fracture: Conchoidal; Specific gravity: 2.64-2.71

Formation & geological history

Formed through a process called pseudomorphism, where quartz replaces the mineral crocidolite (blue asbestos) over millions of years while retaining the fibrous structure.

Uses & applications

Polished into cabochons for jewelry, used in decorative carvings, and highly valued by crystal collectors for its chatoyancy.

Geological facts

The 'cat's eye' effect in Tiger's Eye is known as chatoyancy. It is a metamorphic rock that starts as a blue mineral (Hawk's Eye) before turning golden through iron oxidation.

Field identification & locations

Identify by its silky, fibrous appearance and yellow-to-brown bands. Found primarily in South Africa, Australia, and Thailand. Collectors look for strong light reflection and straight bands.

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