sedimentary

Brown sandstone or weathered iron-rich sedimentary rock

Likely quartz-rich sandstone, potentially ferruginous sandstone; exact identification requires testing

AI-generated identification · may be incorrect

Fine-grained, matte to slightly earthy luster, brown from iron-oxide staining, with no visible crystals or cleavage. Likely Mohs hardness around 6–7 if quartz-rich; moderately dense and possibly porous.

Identified September 5, 2026More sedimentary →

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At a glance

Common name: Brown sandstone or weathered iron-rich sedimentary rock
Scientific name: Likely quartz-rich sandstone, potentially ferruginous sandstone; exact identification requires testing
Category: sedimentary
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary hand specimen; attractive, unusual, or locality-labeled pieces may sell for $10–$30.

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 from cemented sand grains in an ancient river, beach, dune, or shallow-marine environment, then weathered and naturally rounded. Its precise geological age cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, landscaping, and aggregate; this small rounded specimen has mainly educational or decorative value.

Geological facts

The dark-brown color commonly reflects hematite or limonite cement. A vinegar reaction would generally be absent unless carbonate cement is present.

Field identification & locations

Look for gritty texture, visible sand grains, and scratches from a steel knife or glass; quartz-rich sandstone can scratch glass, while carbonate-rich varieties fizz weakly in dilute acid. Common worldwide, especially in sedimentary basins.