mineral
Hematite (specular hematite)
Hematite, α-Fe₂O₃ (iron(III) oxide)
AI-generated identification · may be incorrectDark steel-gray to black with a metallic-to-submetallic luster and an irregular, rough surface. Mohs hardness 5–6; trigonal crystal structure, typically no obvious cleavage, and specific gravity about 5.0–5.3.
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Physical properties
Dark steel-gray to black with a metallic-to-submetallic luster and an irregular, rough surface. Mohs hardness 5–6; trigonal crystal structure, typically no obvious cleavage, and specific gravity about 5.0–5.3.
Formation & geological history
Forms in sedimentary iron formations, hydrothermal veins, and as an oxidation product of iron-bearing minerals; deposits range from ancient Precambrian formations to younger environments. The photo alone cannot establish the specimen’s age or locality.
Uses & applications
A major iron ore used to make steel; also used as pigment and, when attractive and polished, in jewelry and collections.
Geological facts
Despite its dark metallic appearance, hematite leaves a distinctive reddish-brown streak on unglazed porcelain.
Field identification & locations
The rounded, shiny black specimen is consistent with hematite, but appearance alone is not conclusive; check its unusually heavy feel and reddish-brown streak. Common worldwide, including major deposits in Brazil, Australia, and South Africa.
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