mineral

Tumbled hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-bearing silicates

AI-generated identification · may be incorrect

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.

Identified August 30, 2026More mineral →

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Physical properties

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.