mineral

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, with no visible cleavage and conchoidal fracture. The smooth oval shape indicates natural water wear or mechanical tumbling; exact identification is limited by the image.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms in igneous, metamorphic, and sedimentary environments through cooling silica-rich melts, hydrothermal fluids, or sediment cementation. Its geological age may range from recent alluvial deposits to billions of years.

Uses & applications

Common quartz pebbles are used for landscaping, craft projects, tumbling, décor, and low-cost specimen collections; higher-quality quartz is used in glass, electronics, and gemstones.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Look for a glassy surface, hardness sufficient to scratch ordinary glass, lack of cleavage, and a white streak. Common in river gravels, beaches, veins, and weathered granitic terrains worldwide.