mineral
Tumbled hematite (specular iron ore)
Hematite, α-Fe₂O₃
AI-generated identification · may be incorrectDark steel-gray to black, metallic-to-submetallic luster; hardness 5–6.5 Mohs, trigonal crystal structure, no prominent cleavage, and specific gravity about 5.0–5.3. The rounded shape and shine indicate polishing; visual identification is not definitive.
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Physical properties
Dark steel-gray to black, metallic-to-submetallic luster; hardness 5–6.5 Mohs, trigonal crystal structure, no prominent cleavage, and specific gravity about 5.0–5.3. The rounded shape and shine indicate polishing; visual identification is not definitive.
Formation & geological history
Forms through oxidation and precipitation of iron, in sedimentary iron formations, hydrothermal veins, and weathered iron-rich rocks. Hematite occurs from ancient Precambrian deposits to modern environments.
Uses & applications
Used as iron ore and pigment; polished pieces are sold as inexpensive collectibles and jewelry stones.
Geological facts
Despite its metallic appearance, hematite is an iron oxide; its streak is characteristically reddish brown.
Field identification & locations
Common worldwide, including major deposits in Australia, Brazil, and the Lake Superior region. A reddish-brown streak on unglazed porcelain helps distinguish it from lookalikes.
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