mineral
Weathered iron-rich rock, possibly hematite-bearing chert
Hematite (Fe₂O₃), likely mixed with silica and iron oxides
AI-generated identification · may be incorrectDark reddish-brown to gray, earthy-to-submetallic luster, irregular massive texture, and no obvious cleavage; estimated Mohs hardness 5–6, with a characteristic red-brown streak if hematite-rich. The image alone cannot confirm mineral identity.
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Physical properties
Dark reddish-brown to gray, earthy-to-submetallic luster, irregular massive texture, and no obvious cleavage; estimated Mohs hardness 5–6, with a characteristic red-brown streak if hematite-rich. The image alone cannot confirm mineral identity.
Formation & geological history
Likely formed by oxidation and concentration of iron in sedimentary or hydrothermal material, potentially billions of years old; surface weathering has produced the brown-red coloration.
Uses & applications
Common hematite is used as an iron ore, pigment, polishing compound, and decorative stone; ordinary pieces have little jewelry value.
Geological facts
Hematite’s diagnostic feature is its red to reddish-brown streak, even when the specimen appears black or brown. Magnetic response is usually weak unless mixed with magnetite.
Field identification & locations
Common in banded iron formations and weathered iron-rich deposits worldwide, including Brazil, Australia, India, and the Lake Superior region. Test streak on unglazed porcelain and compare hardness against glass.
