mineral

Weathered quartz-rich pebble

Likely quartz aggregate, SiO₂, possibly quartzite or silicified rock

AI-generated identification · may be incorrect

Hardness about 7 Mohs; pale gray to cream, dull-to-waxy luster, granular texture, and no obvious cleavage. The rounded, mottled specimen appears naturally weathered, but its exact identity cannot be confirmed from the photograph alone.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed through crystallization of silica in igneous or hydrothermal settings, or metamorphism of sandstone into quartzite; the rounded shape indicates later stream or beach transport. Its geological age is indeterminate.

Uses & applications

Common quartz-rich pebbles have little commercial value, while clear quartz is used in glass, electronics, abrasives, and ornaments; quartzite is used as aggregate, building stone, and decorative material.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to chemical and physical weathering, allowing it to accumulate in sedimentary environments.

Field identification & locations

Look for glassy translucent edges, conchoidal fracture, and inability to scratch it with a steel knife; quartzite usually shows fused sand grains, while quartz may show distinct crystals. Common worldwide in river gravels, beaches, and quartz veins.