sedimentary

Ironstone / iron-oxide-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification is not possible from the image alone

AI-generated identification · may be incorrect

Rusty orange-brown, earthy to submetallic surface with a darker, reflective wet coating; likely opaque and relatively dense. Hardness varies, commonly about 4–6.5 Mohs for goethite-rich material; crystal structure and cleavage are not discernible here.

Identified September 26, 2026More sedimentary →

Explore Ironstone / iron-oxide-rich rock fragment 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

Iron oxides form as iron-bearing minerals weather and oxidize, or precipitate from iron-rich waters; ironstone deposits span many geological ages and environments.

Uses & applications

Ironstone can be an iron ore where iron content is high; small fragments are mainly collected as specimens and are not typically used for jewelry.

Geological facts

The orange-brown color is characteristic of oxidized iron minerals, but the image does not establish a specific mineral or rock type.

Field identification & locations

Look for rusty streaks, substantial weight, and an ochre-brown streak on unglazed porcelain; a magnet may attract it if it contains magnetite. Found in weathered iron-rich deposits worldwide.