sedimentary

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

Limonite/goethite-rich ferruginous rock; exact identification requires testing

AI-generated identification · may be incorrect

Yellow-brown, dull to earthy luster, irregular granular texture, and no visible crystal faces or cleavage. Likely hardness about 4–6 Mohs, with moderate-to-high specific gravity if strongly iron-rich.

Identified August 8, 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-rich ferruginous rock; exact identification requires testing
Category: sedimentary
Identified: August 8, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary specimen; approximately $10–$30 if unusually attractive, demonstrably ore-rich, or locally 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 intense chemical weathering or cementation of iron-bearing sediments, producing hydrated iron oxides such as goethite and limonite. Its precise age and setting cannot be determined from the photograph.

Uses & applications

Common ferruginous rock has limited commercial value, though iron-rich material may be an ore or used locally as pigment and aggregate. Attractive pieces can be kept as geological specimens.

Geological facts

The term “limonite” describes a mixture of hydrated iron oxides rather than one precisely defined mineral. Yellow, ochre, orange, and brown coloration commonly results from goethite and related iron minerals.

Field identification & locations

Look for a yellow-brown streak, earthy texture, and possible attraction to a strong magnet if magnetite is present; a streak test and hardness test would help distinguish it from iron-rich sandstone, claystone, or slag. Similar materials occur in tropical laterites, weathered ore zones, and sedimentary iron deposits worldwide.