sedimentary

Weathered sandstone or graywacke fragment

Clastic sedimentary rock, likely quartz–feldspar sandstone (exact identification requires testing)

AI-generated identification · may be incorrect

Brown-gray, dull to faintly granular, with weakly visible sedimentary layering and an earthy texture; likely Mohs hardness 6–7 for quartz-rich grains, with no obvious cleavage. Specific gravity is approximately 2.4–2.7.

Identified September 8, 2026More sedimentary →

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At a glance

Common name: Weathered sandstone or graywacke fragment
Scientific name: Clastic sedimentary rock, likely quartz–feldspar sandstone (exact identification requires testing)
Category: sedimentary
Identified: September 8, 2026
Method: Standard

AI Estimated Value

Usually $1–$10 as an unattributed common specimen; potentially $10–$30 if locality, unusual composition, or provenance is documented.

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

Formed when sand-sized mineral and rock fragments were compacted and cemented, commonly by silica, carbonate, or iron oxides; age and depositional environment cannot be determined from the photograph.

Uses & applications

Common sandstone is used for building stone, paving, aggregate, and architectural facing; this irregular specimen has mainly educational or modest collecting value.

Geological facts

The dark, weathered surface and apparent fine layering could also fit graywacke or another lithic sandstone. A fresh broken surface and acid, hardness, and grain-size tests would improve identification.

Field identification & locations

Look for visible sand grains, bedding, and gritty texture; quartz-rich sandstone scratches glass, while carbonate-cemented varieties may fizz weakly in dilute hydrochloric acid. Sandstones occur widely in sedimentary basins worldwide.