mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to cream, translucent to opaque, with a vitreous-to-waxy luster and no cleavage; quartz has a trigonal crystal structure. The rounded shape indicates natural abrasion or tumbling.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids, commonly in veins and pegmatites; individual crystals may range from ancient Precambrian to modern deposits. This specimen is likely a weathered or polished pebble.

Uses & applications

Used in glassmaking, ceramics, abrasives, electronics, construction aggregate, and ornamental stones. Common tumbled pieces have modest decorative and educational value.

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

Identify it by its white translucency, glassy/waxy surface, lack of cleavage, and ability to scratch ordinary glass. Common sources include river gravels, quartz veins, pegmatites, and beaches worldwide.