mineral
Tumbled hematite
Hematite (α-Fe₂O₃)
AI-generated identification · may be incorrectLikely a polished, iron-rich specimen with a dark steel-gray to black surface and metallic-to-submetallic luster. Hematite has Mohs hardness 5–6.5, trigonal crystal structure, and no prominent cleavage; its diagnostic streak is reddish brown.
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Physical properties
Likely a polished, iron-rich specimen with a dark steel-gray to black surface and metallic-to-submetallic luster. Hematite has Mohs hardness 5–6.5, trigonal crystal structure, and no prominent cleavage; its diagnostic streak is reddish brown.
Formation & geological history
Forms through oxidation and precipitation of iron, in sedimentary iron formations, soils, and hydrothermal or metamorphic settings. Hematite occurs from ancient Precambrian deposits to modern environments.
Uses & applications
Used chiefly as iron ore and as a pigment; polished pieces are sold for collecting and ornamental use.
Geological facts
Despite its dark appearance, hematite typically leaves a distinctive red-brown streak when rubbed on unglazed porcelain.
Field identification & locations
The rounded shape and glossy finish suggest tumbling. Check the red-brown streak to distinguish hematite from similar dark minerals; common sources include Brazil, Australia, and the Lake Superior region.
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