mineral
Botryoidal hematite-rich iron ore (probable)
Hematite, Fe₂O₃, possibly mixed with goethite/limonite
AI-generated identification · may be incorrectBlack to brown-black, metallic-to-earthy luster, irregular botryoidal texture, and locally reddish-brown weathering; hematite hardness is about 5–6.5 Mohs, with no prominent cleavage and a reddish-brown streak. The visible pale brown grains may be quartz or other gangue minerals.
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Physical properties
Black to brown-black, metallic-to-earthy luster, irregular botryoidal texture, and locally reddish-brown weathering; hematite hardness is about 5–6.5 Mohs, with no prominent cleavage and a reddish-brown streak. The visible pale brown grains may be quartz or other gangue minerals.
Formation & geological history
Likely formed by oxidation and concentration of iron-bearing minerals in hydrothermal veins, sedimentary iron formations, or weathering zones; age cannot be determined from an image. It may also be industrial iron ore or slag, so a streak, magnetism, and laboratory testing are needed.
Uses & applications
Hematite is an important iron ore, pigment, and ornamental material; attractive botryoidal specimens are collected, while ordinary pieces usually have little commercial value.
Geological facts
Hematite’s diagnostic red streak remains red to reddish-brown even when the specimen appears black. Strong magnetism would suggest magnetite or maghemite rather than pure hematite.
Field identification & locations
Common localities include Brazil, England, Morocco, the Lake Superior region, and Australia. Test an inconspicuous surface on unglazed ceramic; avoid relying on appearance alone because iron slag can look similar.
