mineral
Tumbled hematite-rich ironstone
Hematite (Fe₂O₃), likely mixed with magnetite and iron-bearing silicates
AI-generated identification · may be incorrectDark reddish-brown, metallic to submetallic luster with a naturally or artificially polished surface; typically opaque, dense, and fine-grained. Hematite hardness is about 5–6.5 Mohs, with no prominent cleavage and a red-brown streak.
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Physical properties
Dark reddish-brown, metallic to submetallic luster with a naturally or artificially polished surface; typically opaque, dense, and fine-grained. Hematite hardness is about 5–6.5 Mohs, with no prominent cleavage and a red-brown streak.
Formation & geological history
Formed through oxidation and concentration of iron in hydrothermal, sedimentary, or weathering environments; the specimen is likely a polished river pebble or tumbled commercial material. Precise geological age and locality cannot be determined from the image.
Uses & applications
Used as an iron ore, pigment, polishing powder, and ornamental stone; attractive pieces are sold as pocket stones or cabochons. Common specimens generally have modest value.
Geological facts
A diagnostic red-brown streak distinguishes hematite from many dark metallic minerals; magnetite, if present, may attract a strong magnet. The rounded shape and glossy surface indicate tumbling or water abrasion.
Field identification & locations
Common in iron-rich rocks worldwide, especially Brazil, Australia, South Africa, the United States, and India. Test with an unglazed ceramic tile for streak and use a magnet to check for magnetite.
