metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

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

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

Identified June 21, 2026More metamorphic →

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Physical properties

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

Formation & geological history

Formed through a process called pseudomorphism, where silica (quartz) replaces fibrous blue crocidolite asbestos fibers over time, often retaining the original fibrous structure. Most deposits are approximately 2 billion years old.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular collector's mineral.

Geological facts

The 'cat's-eye' effect is known as chatoyancy. When iron levels are lower, the stone remains blue and is called Hawk's Eye. Roman soldiers once wore it to protect them in battle.

Field identification & locations

Identify in the field by its distinct golden stripes and the moving band of light reflecting off the internal fibers when tilted. Common locations include South Africa (Northern Cape), Australia, and Myanmar.