sedimentary

Rounded white pebble, likely quartz-rich rock

Most consistent with quartzite or milky-quartz pebble; exact identification requires testing

AI-generated identification · may be incorrect

Off-white, smooth and rounded, with a dull to weakly waxy luster and no visible cleavage. Quartz-rich material has Mohs hardness about 7 and specific gravity near 2.65; the image is too blurred to confirm grain texture.

Identified August 10, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely weathered and water-rounded in a stream, beach, or gravel deposit. Quartzite formed when quartz sandstone was metamorphosed; its geological age depends on the source rock and cannot be determined visually.

Uses & applications

Used as decorative gravel, landscaping stone, aggregate, and occasionally as a lapidary or display specimen. A plain pebble generally has little commercial value.

Geological facts

Quartz-rich pebbles resist chemical and physical weathering, allowing them to become smooth and durable. A steel knife should not scratch quartzite, while glass is typically scratched by it.

Field identification & locations

Common in riverbeds, beaches, glacial deposits, and gravel pits. Confirm with a hardness test, streak (white), and acid test; lack of reaction to dilute hydrochloric acid supports quartzite rather than calcite limestone.