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). Color: Golden yellow to deep brown with silky luster. Structure: Hexagonal crystal system (trigonal) with fibrous texture. It exhibits chatoyancy (the cat-eye effect).

Hardness: 6
Color: Golden yellow to deep brown with silky luster

Identified March 15, 2026More metamorphic →

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Physical properties

Hardness: 6.5–7 (Mohs). Color: Golden yellow to deep brown with silky luster. Structure: Hexagonal crystal system (trigonal) with fibrous texture. It exhibits chatoyancy (the cat-eye effect).

Formation & geological history

Formed through a metamorphic process where quartz replaces the asbestos mineral crocidolite, retaining its fibrous structure. This alteration occurs under specific heat and pressure conditions over millions of years.

Uses & applications

Used primarily in jewelry (cabochons, beads), decorative carvings, and as a popular collector's stone. It is also historically used as an amulet for protection and luck.

Geological facts

Known as a 'pseudomorph' because the quartz minerals take the physical form of the pre-existing crocidolite fibers. When heated to high temperatures, it turns into 'Red Tiger's Eye.'

Field identification & locations

Identify by its characteristic chatoyancy—look for a band of light that moves across the surface as the stone is tilted. It is commonly found in South Africa, Western Australia, India, and Myanmar.