mineral
Tumbled hematite
Hematite (Fe₂O₃), possibly specular or massive hematite
AI-generated identification · may be incorrectMohs hardness 5–6.5; dark steel-gray to reddish-brown, metallic to submetallic luster, opaque, with no prominent cleavage and a commonly earthy red-brown streak. The polished, rounded surface and reflective gray areas fit tumbled hematite, though image identification is not definitive.
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Physical properties
Mohs hardness 5–6.5; dark steel-gray to reddish-brown, metallic to submetallic luster, opaque, with no prominent cleavage and a commonly earthy red-brown streak. The polished, rounded surface and reflective gray areas fit tumbled hematite, though image identification is not definitive.
Formation & geological history
Forms through oxidation and precipitation of iron-bearing fluids, in banded iron formations, hydrothermal veins, and sedimentary iron deposits; many major deposits are Precambrian, roughly 2.5–3.5 billion years old.
Uses & applications
Used as an iron ore, pigment, polishing abrasive, and ornamental or jewelry stone. Tumbled pieces are inexpensive collector specimens.
Geological facts
Its diagnostic red-brown streak remains reddish even when the specimen appears black or metallic. Hematite is commonly associated with magnetite, quartz, and jasper.
Field identification & locations
Test an inconspicuous area with an unglazed ceramic tile: hematite leaves a red to reddish-brown streak; it is usually weakly magnetic or nonmagnetic, unlike magnetite. Common sources include Brazil, Australia, South Africa, and the United States.
