mineral

White quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, vitreous-to-waxy luster, hexagonal crystal structure, and indistinct cleavage; the rounded form indicates natural water abrasion or tumbling. Exact identification is limited by the photograph.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids and is extremely resistant to weathering, accumulating as stream or beach pebbles. Quartz formed throughout Earth’s geological history, commonly in veins, granites, and metamorphic rocks.

Uses & applications

Common quartz pebbles are used decoratively, in landscaping, aggregates, abrasives, glass, and silica products; gem-quality varieties are used in jewelry.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. It should scratch ordinary glass but not be scratched by a steel blade.

Field identification & locations

Look for a glassy or waxy surface, conchoidal fracture, no obvious cleavage, and white translucent edges; test cautiously with a glass tile and inspect with a loupe. Common worldwide, especially in river gravels and quartz veins.