sedimentary

Likely iron-rich sandstone or ironstone

Ferruginous sandstone; composition may include quartz (SiO₂) cemented by iron oxides such as hematite (Fe₂O₃) or goethite (FeO(OH))

AI-generated identification · may be incorrect

Brown, dull, fine-grained and rough-looking, with no visible crystals in the image. Hardness and density cannot be established visually; sandstone is commonly Mohs 6–7, while iron-rich cement can vary.

Identified October 8, 2026More sedimentary →

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At a glance

Common name: Likely iron-rich sandstone or ironstone
Scientific name: Ferruginous sandstone; composition may include quartz (SiO₂) cemented by iron oxides such as hematite (Fe₂O₃) or goethite (FeO(OH))
Category: sedimentary
Identified: October 8, 2026
Method: Standard

AI Estimated Value

Approximately $0–$10 for an ordinary, unidentified field specimen; value depends on confirmed identification, size, and appearance.

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 sediment grains cemented by iron oxides during burial or groundwater movement. Its geological age and precise formation setting cannot be determined from the photograph.

Uses & applications

Ferruginous sandstone is sometimes used as building or decorative stone; iron-rich varieties may be collected, but this specimen appears unworked.

Geological facts

The image shows a weathered brown fragment, but it is not possible to distinguish sandstone from other iron-rich rocks reliably without closer examination.

Field identification & locations

Look for gritty quartz grains and reddish-brown iron staining; a fresh broken surface or simple hardness and streak tests can help identify it. Ferruginous sandstones occur worldwide in sedimentary formations.