mineral

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 on the Mohs scale, white to translucent, with a vitreous-to-waxy luster and conchoidal fracture; quartz has a trigonal crystal structure and lacks cleavage. The specimen appears rounded and naturally or manually tumbled, with minor dark inclusions or surface stains.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, or igneous rocks; its rounded shape likely reflects stream abrasion or tumbling. Quartz is common in rocks of many geological ages, from Precambrian terrains to modern sediments.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive milky quartz is used for cabochons, carvings, and mineral collections.

Geological facts

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

Field identification & locations

Identify by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; it commonly occurs in quartz veins, granites, pegmatites, and river gravels worldwide. A hardness test and close inspection for bubbles can help distinguish it from glass.