mineral

Tumbled tiger’s-eye (probable)

Quartz, SiO₂, with fibrous amphibole pseudomorphs

AI-generated identification · may be incorrect

Brown-gold chatoyant bands, vitreous-to-waxy luster, massive structure, no obvious cleavage; hardness about 6.5–7 Mohs and specific gravity ~2.6–2.7. The rounded shape and shine indicate tumbling or polishing.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when crocidolite fibers are replaced by quartz during hydrothermal alteration, commonly in Precambrian metamorphic rocks; major deposits are associated with South Africa and Western Australia. The image alone cannot confirm whether it is tiger’s-eye, hawk’s-eye, or another brown quartzite.

Uses & applications

Used for cabochons, beads, carvings, polished stones, and inexpensive collector specimens; rarely used architecturally.

Geological facts

Chatoyancy is a reflective ‘cat’s-eye’ effect caused by aligned fibrous inclusions. Heating or dyeing may enhance color, so untreated status requires testing or seller documentation.

Field identification & locations

Look for silky, parallel bands that shift brightly when rotated under a light; quartz hardness should resist scratching by ordinary steel. Common sources include South Africa, Australia, India, Brazil, and the United States.