sedimentary

Weathered iron-rich sandstone or ferruginous chert

Likely quartz-rich sandstone (SiO₂) cemented or stained by iron oxides such as goethite/hematite

AI-generated identification · may be incorrect

Brown-orange, dull to earthy luster, fine-grained and strongly weathered, with irregular fractures and possible iron-oxide veining. Estimated hardness is about 6–7 if chert-rich, or 4–6 if sandstone; exact identification requires a scratch and acid test.

Identified September 3, 2026More sedimentary →

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At a glance

Common name: Weathered iron-rich sandstone or ferruginous chert
Scientific name: Likely quartz-rich sandstone (SiO₂) cemented or stained by iron oxides such as goethite/hematite
Category: sedimentary
Identified: September 3, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an unattributed specimen; higher only with unusual provenance, texture, or confirmed lapidary quality.

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

Formed from compacted quartz-rich sediment later cemented by silica and/or iron oxides, likely in a terrestrial or shallow-marine environment; age cannot be determined from the photograph.

Uses & applications

Usually a common field specimen with little commercial value; similar ferruginous sandstone is used as building or paving stone, while dense chert may be used for aggregate and historically for tools.

Geological facts

The orange-brown coloration is characteristic of oxidized iron minerals, commonly goethite and hematite. The apparent breccia-like cracks may reflect weathering, cement failure, or natural fracturing.

Field identification & locations

Look for gritty sand grains to confirm sandstone, a glassy waxy fracture and inability to scratch with a steel knife to suggest chert, and no fizz with dilute hydrochloric acid. Common worldwide in iron-rich sedimentary terrains.