sedimentary

Weathered brown rock, likely sandstone or iron-rich sedimentary stone

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

AI-generated identification · may be incorrect

Brown to gray-brown, dull to weakly earthy luster, apparently fine- to medium-grained and porous, with possible lamination; dominant mineral likely quartz with feldspar, clay, and hematite/goethite. Estimated Mohs hardness 5–7, but the image is insufficient for reliable identification.

Identified September 16, 2026More sedimentary →

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At a glance

Common name: Weathered brown rock, likely sandstone or iron-rich sedimentary stone
Scientific name: Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide cement
Category: sedimentary
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary hand specimen; potentially $10–$30 if it has unusual texture, provenance, or mineralization.

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

Likely formed by deposition, burial, compaction, and cementation of sand in an ancient river, shoreline, or desert setting; age cannot be determined visually. Brown coloration commonly results from oxidation of iron-bearing minerals.

Uses & applications

Common sandstone is used as building stone, paving, aggregate, and occasionally decorative material; this unremarkable specimen has little jewelry value.

Geological facts

Iron oxides can produce yellow, orange, red, or brown coloration and may weather unevenly, creating mottled surfaces.

Field identification & locations

Look for visible sand grains, sedimentary layering, and a gritty texture; dilute hydrochloric acid should not fizz unless carbonate cement is present. Common worldwide, especially in sedimentary basins.