mineral

Tumbled smoky quartz

Quartz (SiO₂), likely smoky variety

AI-generated identification · may be incorrect

Mohs hardness 7; translucent brown to nearly black, with a vitreous luster and conchoidal fracture. Quartz is trigonal and lacks cleavage; the rounded surface indicates tumbling or polishing.

Identified September 16, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent brown to nearly black, with a vitreous luster and conchoidal fracture. Quartz is trigonal and lacks cleavage; the rounded surface indicates tumbling or polishing.

Formation & geological history

Forms in hydrothermal veins, pegmatites, and cavities of igneous rocks when natural irradiation colors clear quartz. Crystals range from Precambrian to recent, depending on the host deposit.

Uses & applications

Used as an ornamental and lapidary stone, jewelry material, and collector specimen; typically modest commercial value.

Geological facts

Smoky color results from radiation-induced color centers associated with trace aluminum. Very dark material may be called morion.

Field identification & locations

Identify by its glassy luster, hardness, rounded conchoidal surfaces, and brown body color; it should scratch ordinary glass but not be scratched by a steel knife. Common sources include Brazil, Madagascar, Switzerland, the United States, and Scotland.