metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Golden yellow to brown with chatoyancy; Luster: Silky; Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64-2.71

Hardness: 6
Color: Golden yellow to brown with chatoyancy
Luster: Silky

Identified July 13, 2026More metamorphic →

Explore Tiger's Eye in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6.5-7 (Mohs); Color: Golden yellow to brown with chatoyancy; Luster: Silky; Structure: Trigonal (fibrous); Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed through a process called pseudomorphism where quartz replaces the fibrous mineral crocidolite (blue asbestos) while maintaining its structure, often in regions of low-grade metamorphism.

Uses & applications

Primarily used for ornamental purposes including jewelry (cabochons), carvings, tumbled stones, and as a popular specimen for collectors.

Geological facts

The unique 'cat-eye' effect is known as chatoyancy, caused by light reflecting off the parallel fibers of the original mineral. It is often heat-treated to create Red Tiger's Eye.

Field identification & locations

Identify by its distinct gold-brown stripes and the shifting optical effect when tilted. Primary sources include South Africa (Northern Cape province) and Western Australia.