mineral

Tumbled milky quartz pebble

Quartz (SiO₂), cryptocrystalline to coarse microcrystalline variety

AI-generated identification · may be incorrect

Typically white to translucent with a glassy-to-waxy luster; Mohs hardness 7, no cleavage, conchoidal fracture, trigonal crystal structure, and specific gravity about 2.65. The rounded shape and smooth surface indicate human tumbling or water abrasion.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Quartz formed when silica-rich fluids crystallized in veins or cavities, commonly in igneous and metamorphic rocks; individual crystals may range from Precambrian to recent. This specimen was subsequently polished or naturally worn.

Uses & applications

Used for carvings, decorative stones, abrasives, countertops, and inexpensive jewelry or lapidary work. Common tumbled pieces generally have modest collector value.

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

Common worldwide, especially in quartz veins, pegmatites, granites, and metamorphic terrains. Identify by its hardness, lack of cleavage, translucent white appearance, and inability to scratch with a steel knife while potentially scratching glass.