sedimentary

Rounded quartz-rich pebble

Likely quartzite or quartz-rich sandstone; primarily silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Pale pink-beige, fine-grained, dull to weakly silky luster, and water-worn rounded shape. Quartz has Mohs hardness 7; quartzite is compact and lacks obvious cleavage, while sandstone is more porous and crumbly.

Identified August 25, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably a naturally weathered and transported stream or beach pebble. If quartzite, it formed when quartz sandstone was metamorphosed, commonly during ancient mountain-building events; exact age cannot be determined visually.

Uses & applications

Mainly a common decorative or teaching specimen; quartzite is also used as aggregate, road stone, and dimension stone. Collector value is generally minimal unless unusually patterned or provenance-specific.

Geological facts

The image does not show diagnostic crystals, fossils, or layering, so a precise identification is uncertain. A glassy scratch on the surface or inability to scratch it with a steel knife supports quartz-rich composition.

Field identification & locations

Common in river gravels and beaches worldwide, especially areas with quartz-bearing rocks. Check texture with a hand lens, test hardness, and apply dilute hydrochloric acid only if carbonate minerals are suspected.