mineral

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream, translucent to opaque, with a vitreous-to-waxy luster and no visible cleavage. It is likely rounded by natural transport and/or tumbling; yellow patches may be iron staining or included minerals.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; these pebbles likely derive from weathered quartz veins or quartz-rich rocks. Quartz formed across many geological ages, commonly from Precambrian to modern deposits.

Uses & applications

Common pieces are used for crafts, décor, landscaping, and lapidary tumbling; clear, attractive varieties may be used as gemstones. This specimen has little commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of Mohs hardness 7. Milky appearance results from microscopic fluid inclusions, fractures, or impurities.

Field identification & locations

Identify it by its pale color, glassy/waxy surface, hardness, and lack of cleavage; it should scratch ordinary steel or glass, though testing can damage it. Common in river gravels, quartz veins, beaches, and quartz-rich rocks.