sedimentary

Likely ironstone or ferruginous sandstone fragment

Iron-oxide-cemented sandstone; commonly quartz grains cemented by hematite/goethite (composition cannot be confirmed from the image)

AI-generated identification · may be incorrect

Reddish-brown, dull to slightly earthy surface with irregular fracture; likely Mohs 5–7 depending on cement and grain content. Crystal structure and specific gravity cannot be determined visually; it appears non-crystalline at this scale.

Identified September 27, 2026More sedimentary →

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At a glance

Common name: Likely ironstone or ferruginous sandstone fragment
Scientific name: Iron-oxide-cemented sandstone; commonly quartz grains cemented by hematite/goethite (composition cannot be confirmed from the image)
Category: sedimentary
Identified: September 27, 2026
Method: Standard

AI Estimated Value

About $0–$5 for an ordinary small fragment; more only if its locality or geological context makes it collectible.

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 sand or accumulated as an iron-rich sediment, then lithified. Its age and precise formation setting cannot be determined from the photograph.

Uses & applications

Commonly used as building or landscaping stone when present in larger deposits; this small fragment has mainly educational or modest display value.

Geological facts

Iron oxides produce the characteristic rusty red-brown color and may stain nearby surfaces.

Field identification & locations

Look for gritty sand grains, rusty coloration, and a hard, irregular break; a fresh surface or simple hardness and streak tests would help confirm it. Ferruginous sandstones occur worldwide.