sedimentary

Likely weathered iron-rich stone or ironstone pebble

Goethite/hematite-bearing ironstone (tentative; exact identification requires testing)

AI-generated identification · may be incorrect

Opaque, reddish-brown, fine-grained, and dull to earthy with rounded weathering; likely Mohs hardness about 5–6 and relatively high specific gravity. No visible crystals or cleavage; pale surface patches may be weathering or embedded mineral grains.

Identified August 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed by chemical precipitation or cementation of iron oxides/hydroxides in an ancient soil, sediment, or weathering environment, then rounded by transport. Its precise age and formation setting cannot be determined from the photograph.

Uses & applications

Common ironstone has limited commercial value as low-grade iron ore or aggregate; attractive pieces may be kept as curiosities or used in natural-history collections.

Geological facts

The red-brown color commonly comes from hematite, while yellow-brown alteration commonly reflects goethite or limonite. A reddish streak and strong attraction to a magnet would support an iron-rich identification.

Field identification & locations

Common in weathered terrains, river gravels, deserts, and sedimentary formations worldwide. Test with a streak plate, magnet, hardness scratch test, and specific gravity; the image alone cannot exclude a dyed or tumbled material.