mineral

Likely smoky quartz or quartz-rich tumbled fragment

Quartz, silicon dioxide (SiO₂), possibly smoky quartz

AI-generated identification · may be incorrect

Translucent gray-brown to colorless, with vitreous luster and irregular conchoidal fractures; apparent hardness about 7 Mohs and no obvious cleavage. The rounded edges suggest natural abrasion or tumbling, though the image is insufficient for confident identification.

Identified September 3, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich igneous and hydrothermal fluids, and may occur in veins, pegmatites, and sedimentary deposits. Smoky coloration commonly results from radiation-induced defects; precise age and locality cannot be determined visually.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and construction aggregate; attractive smoky quartz is used in inexpensive jewelry and mineral collections.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a characteristic six-sided crystal form when unrestricted. A scratch test against glass, plus examination for bubbles or flow texture, helps distinguish it from glass.

Field identification & locations

Look for glassy luster, conchoidal fracture, lack of cleavage, and resistance to scratching by a steel file. Common sources include Brazil, Madagascar, the United States, and worldwide quartz-bearing veins.