mineral

Tumbled smoky quartz

Quartz (silicon dioxide, SiO₂), smoky variety

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent smoky brown to nearly black, with vitreous luster and conchoidal fracture. The rounded shape is mechanically polished; internal veils and fractures are visible, while the bright cyan rim appears to be reflected light or surface coating.

Identified September 20, 2026More mineral →

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Physical properties

Formation & geological history

Smoky quartz forms when natural irradiation creates color centers in quartz, commonly in granitic pegmatites and hydrothermal veins. It is generally associated with Paleozoic–Mesozoic and younger granitic systems, though the specimen’s age cannot be determined visually.

Uses & applications

Used as a decorative and lapidary stone, in carvings and inexpensive jewelry, and commonly sold as a tumbled healing or display stone.

Geological facts

Smoky quartz is colored by trace aluminum-related defects activated by radiation; heating can reduce or remove the smoky color. Very dark material may be marketed as morion.

Field identification & locations

Identify by its glassy luster, hardness, translucent brown color, and lack of obvious cleavage; it can scratch ordinary glass but not be scratched by steel easily. Common sources include Brazil, Switzerland, the United States, Madagascar, and Scotland.