sedimentary

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

Goethite–hematite (FeO(OH)–Fe₂O₃) in a silicate-rich matrix; exact identification requires testing

AI-generated identification · may be incorrect

Hardness roughly 5–6, earthy brown to reddish-black color, dull to weakly submetallic luster, irregular fracture, and moderate-to-high density. The rusty coloration suggests iron oxides or hydroxides, but the photograph cannot establish mineral composition confidently.

Identified September 1, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, possibly limonite-bearing sandstone or laterite
Scientific name: Goethite–hematite (FeO(OH)–Fe₂O₃) in a silicate-rich matrix; exact identification requires testing
Category: sedimentary
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unattributed hand specimen; more if locality, mineralization, or unusual texture is 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 an iron-bearing parent rock, or as iron-cemented sediment; such materials commonly develop from the Cenozoic onward in oxygen-rich soils and weathering zones.

Uses & applications

Usually a low-value geological specimen; iron-rich rocks may serve as minor iron ore, pigments, or aggregate, but this small piece has no apparent industrial-grade value.

Geological facts

Goethite produces yellow-brown streaks, while hematite typically gives a red-brown streak; these streak tests are more diagnostic than surface color.

Field identification & locations

Common in lateritic soils, weathered outcrops, and ironstone deposits worldwide. Check streak on unglazed porcelain, magnetism, density, and acid reaction; a professional analysis is needed for a precise name.