sedimentary

Likely weathered iron-rich rock or laterite

Laterite or ferruginous sandstone; commonly dominated by goethite/hematite with quartz and clay minerals

AI-generated identification · may be incorrect

Small brown, granular, dull-to-earthy specimen with possible iron staining; likely Mohs 4–6, variable density, and no obvious cleavage or crystal faces. The image is soft-focused, so precise identification requires streak, hardness, and density tests.

Identified September 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Iron-rich weathering concentrates oxides and hydroxides in tropical to subtropical soils, while ferruginous sandstone forms from quartz sand cemented by iron minerals. Formation ages range from recent soil profiles to ancient sedimentary deposits.

Uses & applications

Usually collected as a geological curiosity; laterite is used locally as road material or building stone, while iron-rich sandstone may be an iron ore source. It has negligible jewelry value.

Geological facts

A reddish-brown streak, magnetic response, or metallic sparkles would support abundant iron oxides. A pale streak and strong fizz in dilute acid would suggest a different rock, such as carbonate-bearing material.

Field identification & locations

Common in tropical weathering zones and iron-rich sedimentary terrains worldwide. Test streak on unglazed ceramic, hardness against a steel blade, magnetism, and specific gravity; the specimen may also be a common dark pebble rather than laterite.