metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.64–2.71

Hardness: 6
Color: Golden-brown to yellow-gold
Luster: Silky

Identified March 14, 2026More metamorphic →

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Physical properties

Hardness: 6.5–7 on Mohs scale; Color: Golden-brown to yellow-gold; Luster: Silky; Crystal structure: Hexagonal/Trigonal; Cleavage: None; Specific gravity: 2.64–2.71

Formation & geological history

Formed through the metamorphic process known as pseudomorphism, where quartz replaces fibrous crocidolite (blue asbestos) and is later oxidized by iron to create the golden-brown color. Found in metamorphic rocks often billions of years old.

Uses & applications

Primarily used in jewelry (cabochons, beads), decorative carvings, and as a popular semi-precious stone for collectors and metaphysical practitioners.

Geological facts

Tiger's Eye is famous for its chatoyancy, an optical effect that produces a vertical streak of light resembles a cat's eye. Historically, Roman soldiers wore it for protection in battle.

Field identification & locations

Identify by its distinct golden-brown horizontal banding and the 'moving' optical band of light (chatoyancy) when tilted. Major deposits are found in South Africa, Australia, and India. Collectors should look for vibrant contrast and chatoyancy.