mineral

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Undetermined; likely iron oxides/hydroxides (goethite–hematite–limonite) in a silicate host

AI-generated identification · may be incorrect

Brown-black, dull to earthy luster, irregular granular texture, and apparent weathering rind; likely Mohs hardness about 4–6, with no visible cleavage. The yellow-brown areas suggest hydrated iron oxides, while darker portions may be magnetite or basaltic material.

Identified August 13, 2026More mineral →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone
Scientific name: Undetermined; likely iron oxides/hydroxides (goethite–hematite–limonite) in a silicate host
Category: mineral
Identified: August 13, 2026
Method: Standard

AI Estimated Value

$1–$10 for an ordinary hand specimen; $10–$30 if unusually aesthetic or demonstrably mineralogically significant.

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 oxidation and chemical weathering of an iron-bearing igneous or sedimentary rock; age cannot be determined from the image. Such specimens commonly develop in soil, laterite, hydrothermal zones, or weathered ore deposits.

Uses & applications

Iron-rich material may be collected as a mineral specimen or used historically as iron ore and pigment; this individual piece has no obvious industrial value without assay.

Geological facts

A magnet test, streak test on unglazed porcelain, and a fresh break would greatly improve identification. Limonite is a mixture rather than a single mineral, commonly dominated by goethite.

Field identification & locations

Common in iron-rich soils and ore districts worldwide; look for yellow-brown streak, reddish-brown powder, high density, and possible magnetism. Avoid relying on color alone because rusted slag and industrial material can look similar.