mineral

Tumbled tiger’s-eye

Quartz variety: fibrous golden-brown quartz (SiO₂), commonly pseudomorphic after crocidolite

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; golden-brown bands, vitreous to silky luster, and distinctive chatoyancy (cat’s-eye sheen) caused by aligned fibers. Massive and microcrystalline, with no obvious cleavage; specific gravity about 2.6–2.7.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms when crocidolite asbestos fibers are replaced and cemented by quartz during low-grade alteration, producing banding and chatoyancy. Major deposits occur in Proterozoic rocks of South Africa and Western Australia.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and ornamental objects; attractive specimens have modest jewelry and collector value.

Geological facts

Rotating the stone under a focused light reveals a narrow reflective band that moves across the surface. Red varieties are called “red tiger’s-eye,” while blue-gray material is hawk’s-eye.

Field identification & locations

Identify by its silky, mobile light band and parallel golden-brown layers; it should not show glittery mica flakes or glasslike transparency. Commonly sold tumbled and polished.