sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; composition predominantly SiO₂

AI-generated identification · may be incorrect

Small, water-worn oval pebble with a pale cream-to-pink color, dull granular luster, and faint reddish staining. Quartz has Mohs hardness 7, no cleavage, and conchoidal-to-uneven fracture; exact identification requires a scratch or acid test.

Identified September 20, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from quartz-rich sediment that was lithified, or from sandstone metamorphosed into quartzite, then rounded by stream or beach transport. Its age is indeterminate from the image and could range from ancient bedrock material to a younger sedimentary deposit.

Uses & applications

Commonly collected as a natural pebble, landscaping stone, or craft material; quartzite can also be used as aggregate and dimension stone. It has little gem value unless unusually colorful, patterned, or from a known locality.

Geological facts

The apparent pink and brown colors likely reflect iron-oxide staining or minor feldspar rather than a distinct gemstone mineral. A glassy scratch test can help distinguish quartz-rich material from softer limestone.

Field identification & locations

Look for a gritty quartz texture, absence of fizz in dilute hydrochloric acid, and inability to scratch it with a steel knife; quartz should scratch glass. Common in river gravels, beaches, glacial deposits, and eroded quartz-bearing terrains.