mineral

Botryoidal hematite–goethite specimen (probable)

Hematite (Fe₂O₃) with goethite (FeO(OH)), possibly limonite

AI-generated identification · may be incorrect

Dark gray to black, irregular botryoidal/reniform surface with rusty-brown iron-oxide areas; typically earthy to submetallic luster, Mohs hardness about 5–6.5, high density, and no obvious cleavage. Identification is tentative because the image is blurry;…

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms by oxidation and weathering of iron-bearing minerals, commonly as cavity coatings, concretions, or hydrothermal precipitates. These iron oxides occur from ancient Precambrian deposits to modern weathering environments.

Uses & applications

Used as iron ore and pigment; attractive botryoidal pieces are collected as mineral specimens. Common material is usually low-value unless exceptionally lustrous, sculptural, or from a notable locality.

Geological facts

Hematite is the principal red pigment mineral and a major source of iron. Goethite and limonite commonly intermingle with hematite, making visual separation difficult.

Field identification & locations

Common in iron-rich soils, banded iron formations, mine dumps, and oxidized veins worldwide, especially Brazil, Australia, China, and the United States. Check streak, heft, magnetism, and a fresh surface; avoid destructive testing on valuable specimens.