sedimentary

Weathered sandstone or iron-rich sedimentary rock

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

AI-generated identification · may be incorrect

Tan-gray, dull to earthy luster, very fine to medium granular texture, and irregular rounded weathering. Estimated hardness 5–7 if quartz-rich; cleavage absent and specific gravity roughly 2.2–2.7.

Identified September 9, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or iron-rich sedimentary rock
Scientific name: Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining
Category: sedimentary
Identified: September 9, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as an unprovenanced hand specimen; higher only if laboratory testing reveals an unusual mineral, fossil, or meteorite.

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 lithified sand deposited in an ancient river, beach, or desert environment, then cemented by silica, calcite, or iron oxides and later weathered. Geological age cannot be determined from the photograph.

Uses & applications

Ordinary material has little commercial or collector value; sandstone may be used for building stone, paving, aggregate, or abrasives when sound and uniform.

Geological facts

The knobby, weathered shape may reflect differential erosion around harder cemented patches, but the image alone cannot confirm a specific rock type or fossil.

Field identification & locations

Look for visible sand grains, gritty texture, weak layering, and a streak of rusty red-brown iron oxide; acid fizz would suggest calcite cement. Common worldwide in sedimentary basins.