mineral

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; pale translucent white-gray color, vitreous to waxy luster, trigonal crystal structure, and no cleavage. The rounded form indicates natural abrasion or tumbling; internal fractures and inclusions are visible.

Identified August 16, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous, metamorphic, and hydrothermal fluids, with specimens ranging from Precambrian to modern deposits. This piece was likely collected from an alluvial gravel and mechanically polished or naturally water-rounded.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and countertops; attractive tumbled pieces are sold for crafts, display, and inexpensive crystal collecting.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge under pressure. Its cloudy appearance commonly results from microscopic fluid inclusions or fractures.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel knife will not scratch it. Common sources include river gravels and quartz veins worldwide.