mineral

Tumbled smoky quartz

Quartz (SiO₂), likely smoky variety

AI-generated identification · may be incorrect

Mohs hardness 7; translucent gray-brown with a vitreous luster and conchoidal fracture; trigonal crystal structure, no cleavage. The rounded shape and glossy surface indicate tumbling or polishing.

Identified October 14, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent gray-brown with a vitreous luster and conchoidal fracture; trigonal crystal structure, no cleavage. The rounded shape and glossy surface indicate tumbling or polishing.

Formation & geological history

Quartz forms in many igneous and hydrothermal settings; smoky coloration commonly develops when natural radiation alters trace aluminum in the crystal. The image cannot establish its geological age or exact source.

Uses & applications

Used for jewelry, beads, carvings, and collecting; quartz also has major industrial uses in glass and electronics.

Geological facts

Smoky quartz’s color ranges from pale gray to nearly black and can fade with prolonged strong sunlight.

Field identification & locations

Identify by its glassy luster, hardness, and lack of cleavage; common sources include Brazil, Madagascar, and the Alps. This appears to be a small polished tumble, but the photo alone cannot confirm its identity.