mineral

Botryoidal hematite (speculative)

Hematite, iron(III) oxide (Fe₂O₃), possibly mixed with goethite or magnetite

AI-generated identification · may be incorrect

Black to dark steel-gray, rounded botryoidal texture, and metallic to submetallic luster; hematite hardness is 5–6.5 Mohs, with no obvious cleavage and specific gravity about 5.0–5.3. The photograph alone cannot confirm composition; a red-brown streak and strong heft are diagnostic.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms by hydrothermal precipitation, oxidation of iron-rich deposits, or weathering in cavities and sedimentary iron formations. It occurs from Precambrian to modern environments.

Uses & applications

Used as an iron ore and pigment; attractive botryoidal specimens are sold to mineral collectors, usually uncut.

Geological facts

Botryoidal hematite is commonly called “kidney ore” when strongly rounded. Magnetite-rich material may be magnetic, while pure hematite is generally weakly magnetic or nonmagnetic.

Field identification & locations

Common localities include Brazil, Morocco, England, Mexico, and the United States. Test streak on unglazed porcelain: hematite leaves red to reddish-brown, whereas magnetite leaves black; avoid relying on appearance alone.