mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectTypically 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.
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Physical properties
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.
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.
