mineral

Polished hematite

Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen

AI-generated identification · may be incorrect

Metallic to submetallic gunmetal-gray color and strong polish; Mohs hardness 5–6.5, trigonal crystal structure, no prominent cleavage, and high specific gravity around 5.0–5.3. The smooth rounded shape indicates tumbling or cabochon polishing.

Identified August 15, 2026More mineral →

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Physical properties

Formation & geological history

Forms through oxidation of iron-rich rocks, hydrothermal activity, sedimentary deposition, or metamorphism; deposits range from Precambrian banded iron formations to younger hydrothermal veins. This piece may also contain minor magnetite or silica, suggested by its subtle banding.

Uses & applications

Used as an iron ore, pigment, polishing powder, and ornamental stone; polished hematite is inexpensive jewelry and lapidary material.

Geological facts

Despite its metallic appearance, hematite is not usually strongly magnetic; a reddish-brown streak on unglazed ceramic is diagnostic. Some marketed “magnetic hematite” is actually synthetic or magnetite-rich material.

Field identification & locations

Common localities include Brazil, Australia, South Africa, the United States, and England. Test streak rather than relying on appearance; genuine hematite leaves a red to reddish-brown streak.