metamorphic
Polished tiger iron
Tiger iron; interbanded tiger’s-eye (quartz), red jasper, and specular hematite/magnetite
AI-generated identification · may be incorrectTypically Mohs 6.5–7; reddish-brown jasper bands, golden-brown chatoyant quartz, and black metallic iron-oxide bands. Opaque, with vitreous to silky luster and no consistent cleavage; specific gravity commonly about 2.7–3.3.
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Physical properties
Typically Mohs 6.5–7; reddish-brown jasper bands, golden-brown chatoyant quartz, and black metallic iron-oxide bands. Opaque, with vitreous to silky luster and no consistent cleavage; specific gravity commonly about 2.7–3.3.
Formation & geological history
A Precambrian banded iron formation metamorphosed and later silicified, producing alternating quartz, jasper, and iron-oxide layers; major material is associated with rocks roughly 2.2 billion years old.
Uses & applications
Used as ornamental stone, cabochons, carvings, beads, and polished collectibles; occasional interior decoration. Its value is mainly aesthetic rather than industrial.
Geological facts
The bright streaks and bands result from contrasting silica, iron oxides, and jasper. Chatoyant golden areas may show a cat’s-eye effect when cut parallel to fibrous quartz inclusions.
Field identification & locations
Identify it by its red-brown, black, and golden layered pattern, strong polish, and occasional chatoyancy; it is commonly sourced from Western Australia, especially the Hamersley region. Avoid confusing it with ordinary jasper or mahogany obsidian.
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