mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Small, rounded, translucent-white pebble with a vitreous-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, hexagonal crystal structure, and specific gravity about 2.65. Its cloudy appearance is caused by microscopic fluid inclusions or fractures.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, hydrothermal, and metamorphic fluids; milky varieties commonly form in veins and pegmatites. The specimen appears mechanically tumbled and polished rather than naturally worn; quartz ranges from Precambrian to modern formations.

Uses & applications

Used for glass, ceramics, abrasives, electronics, countertops, and decorative stone; attractive pieces are sold as inexpensive cabochons or worry stones.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure.

Field identification & locations

Identify it by its glassy appearance, hardness sufficient to scratch ordinary glass, lack of cleavage, and white translucency; common worldwide, especially in quartz veins, granites, and hydrothermal deposits.