mineral

Tiger’s eye

Quartz (SiO₂), pseudomorphic fibrous quartz with crocidolite inclusions

AI-generated identification · may be incorrect

Typically golden-brown with chatoyant, silky bands; vitreous to silky luster; Mohs hardness 6.5–7; no cleavage; conchoidal fracture; trigonal quartz structure. The pictured piece appears polished or tumbled.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when quartz replaces fibrous blue asbestos (crocidolite), preserving its fibers; oxidation produces the golden-brown color. Major deposits are associated with Precambrian rocks, especially in South Africa, Western Australia, India, and Brazil.

Uses & applications

Used for cabochon jewelry, beads, carvings, ornamental objects, and inexpensive decorative specimens; not generally used as a construction stone.

Geological facts

Its moving band of reflected light is called chatoyancy, caused by aligned fibers. Blue-gray material is hawk’s-eye, while red varieties are often heat-treated tiger’s eye.

Field identification & locations

Identify it by its parallel silky bands and bright light stripe that moves when the stone is rotated; it should be harder than glass and lack distinct cleavage. Avoid cutting or grinding, since residual asbestos-group fibers may pose a dust hazard.