mineral

Tumbled tiger’s eye

Quartz (SiO₂) with fibrous crocidolite-derived inclusions

AI-generated identification · may be incorrect

Mohs hardness 7; polished brown-gold bands with a silky luster and chatoyant, moving band of light. Trigonal quartz; no visible cleavage, specific gravity about 2.6–2.7.

Identified September 25, 2026More mineral →

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Physical properties

Mohs hardness 7; polished brown-gold bands with a silky luster and chatoyant, moving band of light. Trigonal quartz; no visible cleavage, specific gravity about 2.6–2.7.

Formation & geological history

Forms when quartz replaces fibrous crocidolite during low-grade alteration, preserving its aligned fibers; commonly associated with Precambrian rocks, notably in South Africa and Western Australia.

Uses & applications

Used for beads, cabochons, jewelry, carvings, and decorative objects; also collected as a polished gemstone.

Geological facts

Its shifting reflective band is called chatoyancy, from the catlike appearance of the light. The pictured specimen appears shaped and polished, rather than raw.

Field identification & locations

Identify it by golden-brown parallel bands and a bright, narrow reflection that shifts as the stone turns; common sources include South Africa, Australia, India, and Brazil. Small tumbled pieces typically sell for about $2–$15 USD, depending on size and finish.