metamorphic

Polished tiger’s-eye with black hematite/goethite band

Quartz (SiO₂), fibrous pseudomorph after crocidolite, with iron oxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown-golden body with a dark blue-black central band, silky chatoyancy, vitreous-to-waxy luster, and no obvious cleavage. The smooth shape is tumbled or carved; the visible cavity may be a natural inclusion or drill hole.

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Tiger’s-eye forms when quartz replaces fibrous crocidolite during low-grade alteration, while iron oxidation produces its brown color; deposits are commonly Precambrian in age. Major sources include South Africa, Namibia, Western Australia, India, and Brazil.

Uses & applications

Used for beads, cabochons, carvings, ornamental objects, and metaphysical collectibles; it has minor decorative-stone value rather than industrial importance.

Geological facts

Its moving cat’s-eye stripe results from parallel fibers reflecting light. Black material is commonly hematite or residual amphibole, producing “black tiger’s-eye” or related hawk’s-eye coloration.

Field identification & locations

Identify it by the silky, directional band that shifts when rotated, moderate-to-high hardness, and brown iron-stained quartz; it should scratch glass but not be scratched by a steel knife. Common tumbled pieces sell for $5–$30; larger, well-patterned carvings typically bring $30–$150.