metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

AI-generated identification · may be incorrect

Hardness: 6.5–7 (Mohs scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64–2.71.

Hardness: 6
Color: Golden yellow to deep brown
Luster: Silky

Identified March 22, 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 scale); Color: Golden yellow to deep brown; Luster: Silky; Crystal structure: Trigonal (fibrous); Cleavage: None; Specific gravity: 2.64–2.71.

Formation & geological history

Formed when quartz replaces parallel fibers of crocidolite (blue asbestos) through a process of pseudomorphism, preserving the fibrous structure. Iron within the mineral oxidizes, creating the golden-brown color.

Uses & applications

Primarily used in jewelry (cabochons, beads, pendants), ornamental carvings, and as a popular gemstone for mineral collectors due to its unique optical properties.

Geological facts

It exhibits chatoyancy, or the 'cat's-eye effect,' which causes light to reflect off the internal parallel fibers, making the specimen appear to shimmer or move as it is turned.

Field identification & locations

Identify in the field by its distinct chatoyancy (moving bands of light) and golden-yellow to brown banding. Common locations include South Africa (Griequaland West), Western Australia, India, and Namibia.