sedimentary

Weathered brown rock, possibly iron-rich sandstone or limonite

Tentative: ferruginous sandstone (quartz with iron oxides) or limonite/goethite-rich material

AI-generated identification · may be incorrect

Brown-orange, earthy to dull luster, irregular granular surface, and no visible crystals or cleavage; likely Mohs hardness about 4–7 depending on composition. The porous, weathered appearance suggests iron-oxide staining or cement.

Identified August 24, 2026More sedimentary →

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At a glance

Common name: Weathered brown rock, possibly iron-rich sandstone or limonite
Scientific name: Tentative: ferruginous sandstone (quartz with iron oxides) or limonite/goethite-rich material
Category: sedimentary
Identified: August 24, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an unidentified common specimen; potentially $10–$50 if confirmed as attractive ironstone or an ore specimen.

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

Could form as quartz sand cemented by iron oxides, or as hydrated iron-oxide accumulation during weathering; precise age and origin cannot be determined from the photograph. Common in oxidizing soils, sedimentary formations, and weathered ore zones.

Uses & applications

Ferruginous sandstone may be used as building or decorative stone; limonite/goethite has historically been an iron ore and earth pigment. This specimen has limited commercial value unless testing confirms unusual mineralization.

Geological facts

The brown coloration is commonly caused by hematite, goethite, or limonite coatings. A strong streak, magnetism, or unusually high density could indicate iron-rich ore.

Field identification & locations

Look for a yellow-brown to reddish-brown streak on unglazed ceramic, hardness relative to a steel nail, and reaction to dilute acid; these tests help distinguish ironstone from ordinary sandstone. Common worldwide, especially in tropical weathering zones and sedimentary ironstone deposits.