mineral

Iron-rich weathered pebble

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

AI-generated identification · may be incorrect

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.

Identified September 3, 2026More mineral →

Explore Iron-rich weathered pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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.