metamorphic

Polished tiger iron

Tiger iron, a banded aggregate of tiger’s-eye (quartz), red jasper, and hematite/magnetite

AI-generated identification · may be incorrect

Hardness about 6.5–7 (quartz-rich); glossy vitreous to silky luster, with dark metallic iron-oxide bands and red-brown jasper. The polished face shows chatoyant or wavy fibrous bands; no obvious cleavage.

Identified September 17, 2026More metamorphic →

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Physical properties

Formation & geological history

A Precambrian banded iron formation altered by silicification and oxidation, commonly around 2.2–2.5 billion years old. The specimen appears cut and highly polished into a geometric ornamental piece.

Uses & applications

Used for cabochons, carvings, bookends, display pieces, and lapidary décor; valued mainly for dramatic banding and polish.

Geological facts

Tiger iron is not a single mineral but a natural rock aggregate. Its colors arise from contrasting quartz, jasper, and iron oxides, producing patterns that can resemble flames or landscapes.

Field identification & locations

Commonly associated with Australian deposits, especially Western Australia. Identify it by alternating red, black, and golden-brown bands, great polish, and quartz-like hardness; it should not be confused with dyed glass or resin.