igneous
Rounded pebble, likely quartz-rich sandstone or weathered granite
Indeterminate lithic clast; possible granite or quartzose sandstone
AI-generated identification · may be incorrectSmall, water-worn, tan-gray pebble with a dull to slightly granular luster and no visible crystals or cleavage. Hardness is likely about 5–7 Mohs, but exact composition cannot be determined from the image.
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Physical properties
Small, water-worn, tan-gray pebble with a dull to slightly granular luster and no visible crystals or cleavage. Hardness is likely about 5–7 Mohs, but exact composition cannot be determined from the image.
Formation & geological history
Natural abrasion and weathering rounded this clast, probably in a stream, gravel deposit, or glacial sediment. Its geological age is indeterminate and depends on the parent rock.
Uses & applications
Primarily a common landscaping or sedimentary gravel component; it has negligible jewelry or collector value unless testing reveals an unusual composition.
Geological facts
The rounded shape indicates transport by flowing water, waves, or glacial action. A streak, hardness test, and close inspection of grain texture would help distinguish sandstone from granite or quartzite.
Field identification & locations
Commonly found in streambeds, gravel bars, beaches, and glacial till. Test whether it scratches glass, examine fresh chips with a loupe, and apply dilute hydrochloric acid to check for carbonate minerals.
