sedimentary

Small rounded pebble, likely quartz-rich river stone

Indeterminate; likely quartz/chert-bearing lithic clast

AI-generated identification · may be incorrect

Gray-white, rounded, fine-grained pebble with dull to weakly waxy luster; apparent hardness roughly 6–7 Mohs, no visible cleavage, and likely microcrystalline structure. The dark setting and small size prevent reliable mineral identification.

Identified August 11, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably weathered and water-rounded from a pre-existing igneous, metamorphic, or sedimentary source, then deposited in an alluvial or beach environment; its geological age cannot be determined from the image.

Uses & applications

Commonly used as a curiosity, craft stone, or decorative pebble; no significant commercial value unless testing reveals an uncommon material.

Geological facts

The rounded form indicates abrasion during transport, while the pale gray color is consistent with quartz, chalcedony, chert, or a quartz-rich metamorphic fragment.

Field identification & locations

Test for glass-scratching hardness, inspect a fresh edge for translucency, and use streak, specific gravity, and ideally a loupe or chemical testing to distinguish quartz, chert, and altered rock. Common in streambeds, beaches, gravel deposits, and glacial sediments.