sedimentary

Weathered iron-rich rock, possibly laterite or ironstone

Ferruginous sandstone/laterite; commonly composed of hematite (Fe₂O₃), goethite (FeO(OH)), limonite, and quartz

AI-generated identification · may be incorrect

Brown to rusty red, dull earthy luster with scattered reflective grains; massive, fine- to medium-grained texture and no obvious cleavage. Estimated hardness 4–6 Mohs and specific gravity roughly 2.8–4.0, depending on iron content.

Identified September 12, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich rock, possibly laterite or ironstone
Scientific name: Ferruginous sandstone/laterite; commonly composed of hematite (Fe₂O₃), goethite (FeO(OH)), limonite, and quartz
Category: sedimentary
Identified: September 12, 2026
Method: Standard

AI Estimated Value

Typically $1–$15 as an ordinary specimen; attractive polished or strongly crystalline ironstone may sell for approximately $20–$75.

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 intense chemical weathering or cementation of sediment, concentrating iron oxides in tropical or otherwise oxidizing environments. Precise age cannot be determined from the photograph; such material ranges from ancient Precambrian deposits to modern soil horizons.

Uses & applications

Common ironstone may be used as iron ore, aggregate, or decorative landscaping stone; ordinary specimens have little jewelry value.

Geological facts

The metallic-looking flecks are probably iron-oxide coatings or quartz/mica grains rather than visible native metal. A streak test, magnet test, and fresh broken surface would substantially improve identification.

Field identification & locations

Common in tropical weathering profiles and iron-rich sedimentary formations worldwide, including Australia, India, Brazil, and Africa. A reddish-brown streak, rusty surfaces, and possible weak magnetism support ironstone; fizzing in dilute acid would suggest carbonate instead.