sedimentary

Iron-rich weathered rock, possibly goethite/limonite-bearing sandstone or ironstone

Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite, Fe₂O₃)

AI-generated identification · may be incorrect

Brown to rusty orange, earthy to dull luster, irregular fracture, and no visible crystal faces; typical hardness is about 4–5.5 Mohs, with moderate-to-high density. The image alone cannot distinguish ironstone from weathered basalt or iron-stained sandstone.

Identified August 16, 2026More sedimentary →

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At a glance

Common name: Iron-rich weathered rock, possibly goethite/limonite-bearing sandstone or ironstone
Scientific name: Limonite (hydrated iron oxides; chiefly goethite, FeO(OH), with hematite, Fe₂O₃)
Category: sedimentary
Identified: August 16, 2026
Method: Standard

AI Estimated Value

$1–$10 for a common rough piece; $20–$100+ if it displays exceptional botryoidal goethite or unusual mineral associations.

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

Forms through oxidation and weathering of iron-bearing minerals, or by sedimentary precipitation and cementation in terrestrial or shallow-marine environments; age is indeterminate from appearance alone.

Uses & applications

Used historically as an iron ore and pigment; ordinary specimens have little industrial or jewelry value, though attractive botryoidal goethite can be collectible.

Geological facts

The brown color commonly reflects hydrated iron oxides, while darker areas may contain hematite or manganese oxides. A reddish-brown streak and attraction to a magnet can help characterize it.

Field identification & locations

Common in weathering zones, soils, ironstone beds, and many sedimentary terrains worldwide. Test streak on unglazed porcelain, density, and magnetism; avoid assuming it is a meteorite without laboratory analysis.