mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent with a vitreous-to-waxy luster; trigonal crystal structure, but tumbling has rounded and obscured crystal faces. It shows no obvious cleavage and has conchoidal fracture, though the surface appears smooth and worn.

Identified September 12, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as quartz veins or silica-rich igneous material, then weathered and rounded naturally or in a tumbler. Quartz formed throughout geologic time, commonly from hydrothermal and igneous processes.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, and electronics; attractive tumbled pieces are used in jewelry and décor. This specimen is usually worth about $1–$10.

Geological facts

The cloudy appearance comes from microscopic fluid inclusions, fractures, or fine mineral impurities. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Common in river gravels, veins, pegmatites, and quartz-rich rocks worldwide. Identification clues include its glassy translucence, lack of cleavage, hardness sufficient to scratch ordinary glass, and resistance to weathering.