mineral

Tumbled clear quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; colorless to smoky-clear, vitreous luster, translucent with conchoidal fracture and no cleavage. The rounded shape indicates tumbling or natural water abrasion; internal fractures create the cloudy reflections.

Identified September 5, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, igneous melts, and metamorphic rocks; specimens may range from Precambrian to modern geological settings. This piece is likely a commercially tumbled fragment rather than an intact crystal.

Uses & applications

Used for ornamental stones, lapidary work, glass and silicon production, and electronics; clear gem-quality quartz is sometimes used in jewelry. Common tumbled pieces have modest value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric, producing an electrical charge when mechanically stressed. It is also the defining mineral of the Mohs hardness scale’s value 7.

Field identification & locations

Identify by its glassy luster, hardness, lack of cleavage, and conchoidal fracture; it should scratch ordinary glass but not be scratched by a steel knife. Common localities include Brazil, Madagascar, the United States, and worldwide quartz veins.