mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent with a vitreous-to-waxy luster; trigonal crystal structure, no cleavage, and conchoidal fracture. The rounded shape indicates natural water wear or tumbling.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids; milky quartz commonly forms in veins. Its exact geological age cannot be determined from the photograph and may range from ancient to recent host-rock formation.

Uses & applications

Used for decorative stones, lapidary work, countertops, glass, ceramics, and electronics-grade silica; this small tumbled piece has modest ornamental value.

Geological facts

The cloudy appearance results from microscopic fluid inclusions or fractures. Quartz is among Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its white translucent body, glassy sheen, lack of cleavage, and resistance to scratching; it should scratch ordinary glass, though testing can damage the specimen. Common in quartz veins, stream gravels, and many gravel deposits.