metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

AI-generated identification · may be incorrect

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

Hardness: 6

Identified March 31, 2026More metamorphic →

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Physical properties

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

Formation & geological history

Formed through the replacement of fibrous crocidolite asbestos by silica (quartz). This pseudomorph process happens over millions of years under high pressure and heat in metamorphic environments.

Uses & applications

Primarily used as a semiprecious stone in jewelry (beads, cabochons), carvings, and decorative ornaments. It is a popular material for tumbling and crystal healing collections.

Geological facts

Exhibits a optical effect known as chatoyancy (cat's-eye effect). Historically, Roman soldiers wore it for protection in battle. If the material is oxidized, it turns red (Bull's Eye); if it remains blue/grey, it is called Hawk's Eye.

Field identification & locations

Identify in the field by its distinct silky luster and moving bands of light (chatoyancy) when rotated. Found commonly in South Africa, Australia, Burma, and Namibia. Collectors look for high contrast in banding.