gemstone

Tiger’s eye

Quartz (SiO₂), fibrous pseudomorph after crocidolite

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; golden-brown to dark brown chatoyant bands, vitreous to silky luster, opaque, and non-cleavable with conchoidal fracture. The polished cabochon shows tiger-eye’s characteristic moving “cat’s-eye” sheen.

Identified September 10, 2026More gemstone →

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Physical properties

Formation & geological history

Forms when quartz replaces the blue asbestos mineral crocidolite, preserving its fibrous structure; most gem material formed during Precambrian metamorphic alteration, especially in South Africa. It commonly occurs in iron-rich metamorphic rocks.

Uses & applications

Used for cabochons, rings, beads, carvings, and ornamental objects; it is valued mainly as an attractive semiprecious gemstone rather than for industrial use.

Geological facts

The golden color results from iron oxidation; blue-gray hawk’s-eye and red oxidation varieties are related forms. Chatoyancy is strongest when the stone is cut parallel to the fibers.

Field identification & locations

Identify it by its brown-gold silky bands and distinct reflective chatoyancy under a moving light; it is commonly found in South Africa, Australia, India, Brazil, and the United States. Avoid confusing it with synthetic glass or dyed quartz.