sedimentary

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/ironstone; mainly hydrated iron oxides such as limonite/goethite (FeO(OH)·nH₂O), with possible quartz and clay minerals

AI-generated identification · may be incorrect

Brown to rusty, earthy and dull, with an irregular porous texture and apparent granular fragments. Likely hardness about 4–6, no visible cleavage, and moderate-to-high density; exact properties require testing.

Identified August 16, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone
Scientific name: Laterite/ironstone; mainly hydrated iron oxides such as limonite/goethite (FeO(OH)·nH₂O), with possible quartz and clay minerals
Category: sedimentary
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Generally $1–$10 for an ordinary hand specimen; attractive botryoidal or strongly mineralized examples may sell for $10–$50.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Probably formed by intense chemical weathering and iron enrichment in a soil or sedimentary environment, potentially over millions of years. The specimen appears naturally weathered rather than crystalline.

Uses & applications

Common laterite and ironstone may be used locally as construction aggregate, road material, or low-grade iron ore; this small specimen has mainly educational or modest collecting value.

Geological facts

Iron oxides produce the red-brown coloration and may strongly streak reddish-brown on unglazed porcelain. A magnet test can indicate associated magnetite, though limonite itself is usually weakly magnetic or nonmagnetic.

Field identification & locations

Common in tropical and subtropical weathering zones and iron-rich sedimentary terrains worldwide. Identify with a reddish-brown streak, earthy texture, lack of acid reaction, and possible yellow-brown powder; the photograph alone cannot confirm the exact rock.