sedimentary

Rounded iron-rich pebble, likely hematite-rich sandstone or ironstone

Ironstone (iron-oxide-cemented sedimentary rock; exact mineralogy cannot be confirmed visually)

AI-generated identification · may be incorrect

Brown to gray, dull and fine-grained, with a smooth water-worn surface; likely around 3–6 on the Mohs scale. The image does not show diagnostic crystals or cleavage; heft and a streak test would help distinguish ironstone from other pebbles.

Identified October 3, 2026More sedimentary →

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At a glance

Common name: Rounded iron-rich pebble, likely hematite-rich sandstone or ironstone
Scientific name: Ironstone (iron-oxide-cemented sedimentary rock; exact mineralogy cannot be confirmed visually)
Category: sedimentary
Identified: October 3, 2026
Method: Standard

AI Estimated Value

Usually under $1–$5 as a common pebble; higher value would require confirmed, unusual composition or provenance.

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 when iron oxides cemented sediment, then was rounded by transport in water. Its age and precise formation environment cannot be determined from the image.

Uses & applications

Commonly collected as a pebble or used decoratively; iron-rich rocks have also been mined as iron ore when sufficiently concentrated.

Geological facts

Hematite-rich material typically leaves a reddish-brown streak, a useful identification test on an unpolished surface.

Field identification & locations

The rounded shape suggests abrasion in a stream or shoreline, but appearance alone cannot establish the rock type. Check for a red-brown streak and unusually high heft; similar pebbles occur in many regions.