mineral

Tiger’s-eye (rough fragment)

Quartz variety, chiefly SiO₂, with iron-oxide-rich fibrous inclusions; commonly pseudomorphic after crocidolite

AI-generated identification · may be incorrect

Typically Mohs 6.5–7, golden to brown, silky luster and chatoyant bands; trigonal quartz, with no prominent cleavage. The small, rough specimen appears brown-gold, but its fibers and chatoyancy are not clearly visible in the image.

Identified September 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica replaces crocidolite fibers, with iron oxidation producing golden-brown color; deposits are associated with altered iron-rich rocks, notably in South Africa. The process is ancient, but a specific age cannot be determined from the image.

Uses & applications

Polished tiger’s-eye is used in beads, cabochons, ornaments, and carvings; rough pieces are mainly collected or cut for jewelry.

Geological facts

Its moving, cat’s-eye-like light band is called chatoyancy and is strongest in properly oriented, polished material.

Field identification & locations

Look for parallel golden-brown fibers and a shifting silky band as the specimen is rotated; these features cannot be confirmed here. Common sources include South Africa, Australia, India, and the western United States.