mineral

Weathered iron-rich pebble

Likely limonite/goethite-bearing rock; exact identification requires testing

AI-generated identification · may be incorrect

Brown to olive-gray, dull earthy luster, irregular rounded shape, and apparently fine-grained texture; estimated Mohs hardness 4–6, with no visible cleavage or crystals.

Identified September 4, 2026More mineral →

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Physical properties

Brown to olive-gray, dull earthy luster, irregular rounded shape, and apparently fine-grained texture; estimated Mohs hardness 4–6, with no visible cleavage or crystals.

Formation & geological history

Likely a naturally weathered river or beach pebble containing iron oxides/hydroxides, formed by oxidation of iron-bearing minerals over geologic time; age cannot be determined from the image.

Uses & applications

Usually a low-value curiosity or educational specimen; iron-rich material may be an ore indicator but this piece is not suitable for industrial use without chemical analysis.

Geological facts

Limonite is a mixture rather than a single mineral, commonly consisting largely of goethite and related hydrated iron oxides; its brown coloration results from oxidized iron.

Field identification & locations

Look for a yellow-brown streak, moderate-to-high density, and possible attraction to a magnet if magnetite is present; a streak test, hardness test, and specific-gravity measurement would improve identification. Common in soils, weathered outcrops, stream gravels, and iron-ore districts worldwide.