sedimentary

Possible weathered sandstone or iron-rich sedimentary rock

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

AI-generated identification · may be incorrect

Tan-brown, dull to earthy luster, visibly granular and layered, with irregular fracture and probable moderate porosity; estimated hardness 5–7 if quartz-rich. Exact identification is limited by the photograph and lack of scale or testing.

Identified September 6, 2026More sedimentary →

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At a glance

Common name: Possible weathered sandstone or iron-rich sedimentary rock
Scientific name: Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide cement
Category: sedimentary
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Typically $1–$15 as an unattributed hand specimen; substantially more only if laboratory testing reveals a distinctive fossil, mineral, or provenance.

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, dune, or shallow-marine environment, then compacted and cemented; age cannot be determined visually. Brown coloration commonly comes from hematite or goethite coatings/cement.

Uses & applications

Common sandstone is used for building stone, paving, walls, aggregate, and landscaping; ordinary hand specimens generally have little commercial or collector value.

Geological facts

The specimen appears strongly weathered or partly friable, and may alternatively be a fragment of iron-stained shale, mudstone, or a fossil-bearing sedimentary material.

Field identification & locations

Look for sand-sized grains, bedding, and a quartz-rich composition; a steel nail should generally not scratch quartz sandstone, while vinegar should produce no fizz unless carbonate cement is present. Common worldwide in sedimentary basins.