mineral

Botryoidal hematite/goethite specimen

Hematite (Fe₂O₃), likely mixed with goethite (FeO(OH))

AI-generated identification · may be incorrect

Hardness about 5–6.5 Mohs; black to dark brown, metallic to submetallic luster, irregular botryoidal texture, and no obvious cleavage. The reddish-brown interior or streak commonly indicates iron oxides.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when iron-rich groundwater precipitates oxides and hydroxides in cavities, veins, or weathered zones; deposits range from ancient Precambrian formations to modern weathering environments. Exact age and locality cannot be determined from the image.

Uses & applications

Used chiefly as an iron ore and pigment; attractive botryoidal pieces are collected as mineral specimens. It is generally not gem-quality or suitable for jewelry.

Geological facts

Hematite produces a distinctive red-to-reddish-brown streak even when its surface appears black; goethite commonly forms brown, earthy, or botryoidal coatings with hematite.

Field identification & locations

Identify with a streak test on unglazed porcelain, magnetism testing, and density: hematite is heavy but usually weakly magnetic, while associated magnetite is strongly magnetic. Common localities include Brazil, Morocco, the United States, and Australia.