mineral
Tumbled hematite
Hematite (Fe₂O₃), likely polished specular hematite
AI-generated identification · may be incorrectMetallic, dark steel-gray to nearly black with a smooth polish; Mohs hardness 5–6, trigonal crystal system, no prominent cleavage, specific gravity about 5.3. The image shows a compact, rounded polished piece; a reddish-brown streak is diagnostic, though not visible here.
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Physical properties
Metallic, dark steel-gray to nearly black with a smooth polish; Mohs hardness 5–6, trigonal crystal system, no prominent cleavage, specific gravity about 5.3. The image shows a compact, rounded polished piece; a reddish-brown streak is diagnostic, though not visible here.
Formation & geological history
Forms through oxidation and precipitation of iron, in sedimentary iron formations, hydrothermal veins, and weathered rocks. Hematite deposits span much of Earth’s geological history.
Uses & applications
Used chiefly as iron ore and pigment; polished pieces are sold as jewelry and collectibles.
Geological facts
Despite its metallic appearance, hematite is an iron oxide rather than native metal.
Field identification & locations
Common worldwide, including major deposits in Australia, Brazil, China, and the United States. Distinguish it from magnetite by its red-brown streak and generally weak magnetism; this image alone cannot confirm the identification.
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