gemstone

Tiger’s eye

Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; golden-brown to reddish-brown bands with silky, directional chatoyancy and vitreous-to-silky luster. Usually microcrystalline quartz with no prominent cleavage; specific gravity about 2.64–2.71.

Identified August 11, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when asbestos-like crocidolite fibers are replaced by silica during low-temperature alteration, preserving the fibrous texture that produces the cat’s-eye effect. Major deposits formed in Precambrian rocks, especially in South Africa and Western Australia.

Uses & applications

Used for cabochon jewelry, beads, carvings, and polished specimens; it is generally an ornamental gemstone rather than an industrial material.

Geological facts

Its shifting bright band is caused by reflected light from aligned fibers, known as chatoyancy. Blue varieties are called hawk’s eye, while reddish heat-treated material is often sold as bull’s-eye.

Field identification & locations

Identify it by its parallel golden bands and a bright band that moves across the surface when rotated under a single light; glass lacks this natural fibrous chatoyancy. Common sources include South Africa, Australia, India, Namibia, and the United States.