mineral
Polished hematite
Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen
AI-generated identification · may be incorrectSteel-gray to black, metallic/submetallic luster, opaque, with no visible crystal faces; Mohs hardness 5–6.5, specific gravity about 5.0–5.3, and typically weakly magnetic or nonmagnetic unless mixed with magnetite.
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Physical properties
Steel-gray to black, metallic/submetallic luster, opaque, with no visible crystal faces; Mohs hardness 5–6.5, specific gravity about 5.0–5.3, and typically weakly magnetic or nonmagnetic unless mixed with magnetite.
Formation & geological history
Forms through oxidation of iron-rich minerals in sedimentary, hydrothermal, and metamorphic environments; specimens may range from Precambrian to modern deposits. The smooth shape indicates human tumbling and polishing.
Uses & applications
Used as an iron ore, pigment, and ornamental stone; polished hematite is common in inexpensive jewelry and worry stones.
Geological facts
Hematite leaves a distinctive reddish-brown to red streak on unglazed porcelain, even when its surface appears metallic gray.
Field identification & locations
Common sources include Brazil, Australia, China, the United States, and South Africa. Confirm with its high heft and red-brown streak; a strong magnet suggests magnetite or an iron-rich mixture instead.
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