metamorphic

Tiger's Eye

SiO2 (Quartz with inclusions of altered crocidolite)

AI-generated identification · may be incorrect

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

Hardness: 6
Color: Golden to red-brown
Luster: Silky

Identified June 21, 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 to red-brown; Luster: Silky; Crystal Structure: Trigonal (fibrous texture); Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed as a pseudomorph when quartz replaces the mineral crocidolite (blue asbestos) via metamorphic processes, retaining the fibrous structure while oxidizing iron to create the golden-brown color.

Uses & applications

Primarily used in jewelry (beads, cabochons), ornamental carvings, and as a popular metaphysical or pocket stone.

Geological facts

The shimmering effect shown is called chatoyancy (the cat's-eye effect). If the iron is not fully oxidized, it remains blue and is called Hawk's Eye.

Field identification & locations

Identify by its distinctive silky luster and moving bands of light (chatoyancy) when tilted. Most commonly found in South Africa, Australia, Burma, and India.