mineral
Iron-rich weathered pebble
Likely limonite/goethite-bearing rock; exact identification requires testing
AI-generated identification · may be incorrectBrown to dark gray, earthy to submetallic luster, rounded and naturally worn surface with pits and black iron-oxide patches. Likely hardness about 4–6 Mohs and relatively high specific gravity; no obvious cleavage or crystals are visible.
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Physical properties
Brown to dark gray, earthy to submetallic luster, rounded and naturally worn surface with pits and black iron-oxide patches. Likely hardness about 4–6 Mohs and relatively high specific gravity; no obvious cleavage or crystals are visible.
Formation & geological history
Probably formed by oxidation and weathering of iron-bearing minerals, producing goethite and limonite coatings or replacement material. Such iron-rich concretions and stream-rounded pebbles commonly form in soils, weathering zones, and alluvial deposits; precise age is indeterminate.
Uses & applications
Primarily a geological or lapidary specimen; iron oxides have historically been used as pigments and iron ore, though this small piece has little industrial value. It is not suitable for jewelry unless polished and stable.
Geological facts
A reddish-brown streak on unglazed porcelain would support hematite/goethite, while a yellow-brown streak suggests limonite. Magnetism, if present, may indicate magnetite or another iron-bearing phase.
Field identification & locations
Common in weathered rocks and stream gravels worldwide, especially around iron-rich outcrops. Test streak, hardness, heft, and magnetism; avoid relying on color alone because iron staining is widespread.
