sedimentary

Probable weathered sandstone or iron-rich sedimentary rock

Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining

AI-generated identification · may be incorrect

Brown-gray, dull to slightly granular surface with apparent tan weathering rind; likely Mohs 6–7 if quartz-rich, with no visible cleavage and low-to-moderate specific gravity. The image resolution prevents reliable identification of crystal structure or texture.

Identified September 21, 2026More sedimentary →

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At a glance

Common name: Probable weathered sandstone or iron-rich sedimentary rock
Scientific name: Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining
Category: sedimentary
Identified: September 21, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an unverified fragment; attractive or locality-labeled specimens may sell for roughly $5–$20.

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 lithified sand deposited in an ancient river, beach, dune, or shallow-marine environment, then cemented by silica or iron oxides; age cannot be determined visually. The dark brown coloration may reflect hematite or goethite staining and weathering.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally ornamental material; this fragment has no apparent gem or industrial-grade value.

Geological facts

The specimen appears to be a naturally broken fragment rather than a polished or cut stone. A fresh fracture, hand lens, and acid/abrasion tests would substantially improve identification.

Field identification & locations

Look for visible sand grains, bedding, and a gritty texture; quartz-rich sandstone scratches glass, while carbonate cement may fizz weakly in dilute hydrochloric acid. Common worldwide, especially in sedimentary basins.