mineral

White quartz pebble

Quartz, silicon dioxide (SiO₂), likely massive milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, no cleavage, conchoidal fracture, and hexagonal crystal structure when crystals are developed. The rounded shape indicates natural water wear or tumbling.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids; milky quartz commonly forms in veins and survives erosion as stream or beach pebbles. Its age depends on the source rock, commonly Paleozoic to Precambrian in continental terrains.

Uses & applications

Used in glass, ceramics, electronics, abrasives, countertops, and ornamental stone; attractive pieces are sold as inexpensive specimens or décor.

Geological facts

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

Field identification & locations

Identify it by its glassy sheen, lack of cleavage, white translucence, and ability to scratch ordinary glass; it should not fizz in dilute acid. Common worldwide, especially in river gravels, beaches, and quartz veins.