mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, glassy-to-waxy luster with irregular fracture and no obvious cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. Its rounded shape suggests natural water wear or tumbling.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Formed when silica-rich fluids crystallized in veins or cavities, commonly during igneous and metamorphic processes; the specimen’s precise geological age and source cannot be determined visually. Weathering and transport produced its rounded form.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, electronics, and construction aggregate; attractive pieces are sold as inexpensive mineral specimens or décor.

Geological facts

The cloudy appearance results from microscopic fluid inclusions, fractures, or inclusions. Quartz is one of Earth’s most abundant and chemically resistant minerals.

Field identification & locations

Identify it by its white translucency, hardness—scratching ordinary glass—and lack of cleavage; calcite would be softer and react with acid. Common in stream gravels, quartz veins, pegmatites, and beaches worldwide.