sedimentary

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

Limonite/goethite mixture (hydrated iron oxides), composition uncertain from image

AI-generated identification · may be incorrect

Brown-yellow, earthy to dull luster, irregular granular texture, no visible cleavage; likely Mohs hardness about 4–5, with moderate-to-high density. The rusty coloration suggests iron-oxide staining or cement.

Identified August 30, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite
Scientific name: Limonite/goethite mixture (hydrated iron oxides), composition uncertain from image
Category: sedimentary
Identified: August 30, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand specimen; more if locality, botryoidal form, or associated minerals are documented.

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

Likely formed by chemical weathering and oxidation of iron-bearing minerals near Earth’s surface; such material commonly develops in soils, weathered bedrock, or iron-rich sedimentary deposits. Exact geological age cannot be determined visually.

Uses & applications

Usually collected as a mineralogical or educational specimen; iron-rich rock can be an ore when sufficiently concentrated, but this small piece has no evident commercial value. It is not suitable for gemstones or construction use.

Geological facts

Limonite is a field term for mixtures of hydrated iron oxides rather than a single precisely defined mineral. A yellow-brown streak on unglazed ceramic and attraction to a strong magnet, if present, would help characterize it.

Field identification & locations

Common in laterites, gossans above sulfide deposits, bog iron, and weathered iron-rich rocks worldwide. Test streak, hardness, density, and acid reaction; the photograph is insufficient to distinguish limonite from iron-stained sandstone or altered basalt.