mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to translucent, vitreous-to-waxy luster, massive granular texture, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. Its rounded form indicates natural or human tumbling/water abrasion.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, or hydrothermal fluids and commonly survives weathering as resistant stream or beach pebbles. Its exact geological age and source cannot be determined from the photograph.

Uses & applications

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

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or dispersed mineral impurities that scatter light. Quartz is one of Earth’s most abundant and durable minerals.

Field identification & locations

Identify it by its glassy translucence, hardness—scratches ordinary steel or glass—and lack of cleavage; a streak test is white. Common worldwide, especially in quartz veins, river gravels, and beaches.