igneous
Rounded iron-rich stone, likely weathered basalt or laterite
Probable fine-grained basalt; reddish coloration may reflect hematite/goethite weathering
AI-generated identification · may be incorrectDark reddish-brown, dull to subtly earthy luster, rounded water-worn shape, and fine-grained texture; estimated Mohs hardness 5–6. Crystal grains are too small to resolve, with no obvious cleavage; density likely about 2.8–3.3 g/cm³.
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Physical properties
Dark reddish-brown, dull to subtly earthy luster, rounded water-worn shape, and fine-grained texture; estimated Mohs hardness 5–6. Crystal grains are too small to resolve, with no obvious cleavage; density likely about 2.8–3.3 g/cm³.
Formation & geological history
Probably formed as volcanic basalt, then chemically weathered and rounded by stream or beach transport; the exact geological age cannot be determined visually. Alternatively, it could be an iron-rich lateritic concretion or weathered sedimentary pebble.
Uses & applications
Common specimens have little industrial or jewelry value, though basalt is used for aggregate, road stone, and construction. Attractive polished examples may be collected as landscape or educational specimens.
Geological facts
The red-brown color commonly comes from iron oxides coating or replacing weathered minerals. A streak test, magnet test, and fresh-surface examination would substantially improve identification.
Field identification & locations
Look for tiny dark crystals or occasional vesicles to support basalt; a reddish-brown streak and earthy texture suggest iron-rich weathering. Common in volcanic terrains, river gravels, and laterite-rich soils worldwide.
