sedimentary

Likely weathered sandstone or fine-grained granite

Quartz–feldspar-rich lithic rock; exact identification requires a fresh surface and testing

AI-generated identification · may be incorrect

Gray-brown, fine- to medium-grained, dull to slightly sparkly surface with apparent granular texture and irregular fracture. Likely Mohs hardness 6–7 if quartz-rich; cleavage is not evident, and specific gravity is approximately 2.5–2.7.

Identified August 30, 2026More sedimentary →

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At a glance

Common name: Likely weathered sandstone or fine-grained granite
Scientific name: Quartz–feldspar-rich lithic rock; exact identification requires a fresh surface and testing
Category: sedimentary
Identified: August 30, 2026
Method: Standard

AI Estimated Value

Typically $1–$10 as an ordinary fragment; potentially $10–$30 only if provenance or unusual texture makes it a desirable specimen.

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

The specimen appears naturally weathered and broken, possibly from an exposed outcrop or geologic sampling site. If sandstone, it formed by burial and cementation of sand, generally from Paleozoic to Cenozoic strata; if granite, it crystallized slowly underground and may be much older.

Uses & applications

Sandstone is used for building stone, paving, aggregate, and decorative pieces; granite is widely used for construction, countertops, monuments, and aggregate. This small fragment has negligible commercial value.

Geological facts

The visible granular texture and subdued color are consistent with sandstone, but the image is insufficient to distinguish it confidently from weathered granite or gneiss.

Field identification & locations

Check a freshly broken face: visible interlocking quartz and feldspar crystals suggest granite, while rounded sand grains in a cemented matrix suggest sandstone. Common localities are widespread worldwide; an acid test, hand lens, streak, and hardness test would improve identification.