sedimentary

Weathered iron-rich river pebble

Ferruginous chert or iron-stained jasper (cryptocrystalline SiO₂ with iron oxides)

AI-generated identification · may be incorrect

Typically hardness 6.5–7, opaque rusty orange-brown with black to gray veins, and dull to waxy luster; lacks visible crystals and has no obvious cleavage. The rounded shape and smooth surface indicate water abrasion or tumbling.

Identified September 2, 2026More sedimentary →

Explore Weathered iron-rich river 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

Likely formed from silica-rich chert/jasper later stained or cemented by hematite and goethite during weathering, then transported in a stream or glacial deposit. Exact age and locality cannot be determined from the image.

Uses & applications

Used mainly as a lapidary, landscaping, or collectible stone; attractive pieces may be polished for cabochons or decorative objects, but this specimen appears modestly ornamental.

Geological facts

Iron oxides produce the orange-red coloration, while dark zones may be manganese oxides, magnetite, or inclusions. A polished surface and strong conchoidal fracture would support a chert/jasper identification.

Field identification & locations

Common in iron-rich gravels and weathered volcanic or sedimentary terrains worldwide. Test for glassy/conchoidal fracture and hardness sufficient to scratch ordinary glass; a streak test may show a reddish-brown powder.