
mineral
Weathered iron-rich rock, possibly hematite-bearing breccia
Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image
AI-generated identification · may be incorrectDark reddish-brown to gray, earthy and weakly metallic luster, irregular granular texture, and no obvious cleavage; hematite has Mohs hardness 5–6 and specific gravity about 5.3, though the whole specimen may be lighter due to mixed minerals.
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Physical properties
Dark reddish-brown to gray, earthy and weakly metallic luster, irregular granular texture, and no obvious cleavage; hematite has Mohs hardness 5–6 and specific gravity about 5.3, though the whole specimen may be lighter due to mixed minerals.
Formation & geological history
Likely formed by oxidation and concentration of iron minerals in a weathering zone or sedimentary/volcanic host; its geological age cannot be determined visually. The rusty coloration reflects iron-oxide weathering.
Uses & applications
Common hematite-bearing rock is used as an iron ore, pigment, and mineral specimen; this small, rough piece has little commercial value unless testing confirms unusually rich ore or a rarer host.
Geological facts
Hematite produces a distinctive red-to-reddish-brown streak, even when its exterior appears black or gray. It is generally nonmagnetic, unlike magnetite, though mixed specimens may show weak magnetism.
Field identification & locations
Test an inconspicuous area with an unglazed ceramic tile: a red-brown streak strongly supports hematite. Common sources include Brazil, Australia, the United States, and South Africa; identification would improve with streak, magnetism, hardness, and density tests.
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