sedimentary

Iron-rich lateritic rock (ironstone)

Goethite–hematite-rich ferruginous material; exact identification requires testing

AI-generated identification · may be incorrect

Rough, irregular specimen with reddish-brown iron-oxide coating and darker mineral-rich patches. Goethite is Mohs 5–5.5 and hematite 5–6.5; luster ranges earthy to submetallic, with no prominent cleavage.

Identified October 14, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed by intense chemical weathering that concentrated iron oxides in soil or sediment; such deposits can develop over long periods in warm, humid climates. The image alone cannot establish its age or exact mineral makeup.

Uses & applications

Ironstone may be mined as iron ore when iron content and deposit size are sufficient; ordinary pieces are mainly collected as geological specimens.

Geological facts

Red-brown color commonly comes from hematite or goethite, while black areas may be other iron oxides or unrelated minerals.

Field identification & locations

Look for a heavy feel, rusty streak, and earthy or metallic surfaces; a streak test and density measurement help distinguish iron oxides. Lateritic ironstone occurs in tropical weathering profiles worldwide.