mineral

Tumbled quartz-rich pebble

Microcrystalline quartz/chalcedony, SiO₂ (tentative)

AI-generated identification · may be incorrect

Small rounded tan-and-cream pebble with a dull to slightly waxy luster and no visible cleavage; quartz hardness is about 7 Mohs and specific gravity ~2.65. The image is insufficient to confirm exact mineral identity; it could also be limestone or weathered feldspar.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Likely naturally water-rounded or manually tumbled from silica-rich material; quartz-bearing rocks formed in many geological settings and ages. A scratch test, streak, and close inspection would be needed for reliable identification.

Uses & applications

Common quartz pebbles are used as decorative stones, landscaping aggregate, craft material, and inexpensive specimens; this individual piece has negligible commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms hexagonal crystals, although massive or cryptocrystalline varieties lack visible crystal faces.

Field identification & locations

Look for glassy translucence, conchoidal fracture, and inability to scratch it with a steel knife; vinegar effervescence would instead suggest calcite-rich limestone. Common worldwide, especially in river gravels and quartz veins.