mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), cryptocrystalline to microcrystalline variety

AI-generated identification · may be incorrect

Hardness 7 Mohs; creamy white to pale yellow, opaque to translucent, with a glassy-to-waxy luster and no obvious cleavage. Rounded, smooth surfaces indicate mechanical tumbling or natural water abrasion; specific gravity is about 2.65.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed from silica-rich fluids in veins, cavities, or igneous and metamorphic rocks, likely over geologic timescales from hundreds of millions to billions of years. The specimen’s shape appears human-tumbled or beach/river-worn.

Uses & applications

Used as a decorative pebble, craft material, lapidary stone, and occasionally in inexpensive jewelry; industrial quartz is important in glass, ceramics, electronics, and abrasives.

Geological facts

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

Field identification & locations

Common in quartz veins, granite-derived gravels, riverbeds, beaches, and hydrothermal deposits worldwide. It can be identified by its hardness, lack of cleavage, conchoidal fracture, and inability to scratch with a steel knife while potentially scratching glass.