sedimentary

Rounded gray pebble, likely fine-grained sandstone or weathered granite

Probable quartz-rich sandstone; exact identification requires texture and hardness tests

AI-generated identification · may be incorrect

Light gray-green, dull to weakly earthy luster, fine granular texture, rounded by abrasion, and no visible crystals or cleavage. Estimated hardness 5–7 Mohs; specific gravity approximately 2.5–2.7.

Identified September 6, 2026More sedimentary →

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At a glance

Common name: Rounded gray pebble, likely fine-grained sandstone or weathered granite
Scientific name: Probable quartz-rich sandstone; exact identification requires texture and hardness tests
Category: sedimentary
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Typically $0–$5 as a common pebble; up to about $10 if selected as an attractive local 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

Light gray-green, dull to weakly earthy luster, fine granular texture, rounded by abrasion, and no visible crystals or cleavage. Estimated hardness 5–7 Mohs; specific gravity approximately 2.5–2.7.

Formation & geological history

Likely a naturally weathered and water-worn clast eroded from a sedimentary or crystalline source; age cannot be determined from the photograph. Its rounded shape indicates transport in a stream, beach, or glacial sediment.

Uses & applications

Common pebbles have little commercial value, though sandstone and granite are used in construction, aggregate, paving, and landscaping. This specimen has negligible jewelry or collector value.

Geological facts

The greenish-gray color may reflect chlorite, altered feldspar, or surface staining rather than a distinct mineral species. A close look at grain size and a streak or hardness test would improve identification.

Field identification & locations

Found widely in streambeds, beaches, gravel deposits, and landscaping materials. Test whether it scratches glass, inspect grains with a hand lens, and apply dilute acid only if carbonate minerals are suspected.