mineral
Tumbled hematite
Hematite (Fe₂O₃), likely specular or massive hematite
AI-generated identification · may be incorrectDark gray to black, metallic-to-submetallic luster, smooth tumbled surface, and opaque appearance; Mohs hardness 5–6.5, trigonal crystal system, specific gravity about 5.3, with no obvious cleavage.
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Physical properties
Dark gray to black, metallic-to-submetallic luster, smooth tumbled surface, and opaque appearance; Mohs hardness 5–6.5, trigonal crystal system, specific gravity about 5.3, with no obvious cleavage.
Formation & geological history
Forms through oxidation of iron-rich fluids, sedimentary iron formations, hydrothermal veins, or weathering zones; specimens may range from Precambrian deposits to much younger surface concentrations.
Uses & applications
Used as an iron ore, pigment, polishing abrasive, and ornamental or metaphysical stone; attractive polished pieces are collected and sometimes made into jewelry.
Geological facts
Hematite commonly leaves a distinctive red to reddish-brown streak even when its surface is black or metallic. Its high density makes it feel unusually heavy for its size.
Field identification & locations
Common in Brazil, Australia, China, the United States, Canada, and South Africa. Confirm with a streak test on unglazed porcelain: hematite produces a red-brown streak, unlike magnetite, which produces a black streak and is strongly magnetic.
