mineral

Likely smoky quartz

Quartz (SiO₂), probably smoky variety

AI-generated identification · may be incorrect

Translucent to opaque gray-brown with vitreous luster and irregular/conchoidal-looking fracture; quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65. The rough surface and lighting make identification tentative.

Identified September 29, 2026More mineral →

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Physical properties

Formation & geological history

Smoky quartz forms in silica-rich veins and cavities as quartz crystallizes from hydrothermal fluids or pegmatitic melts; its brown color commonly results from natural radiation affecting trace aluminum. Its age depends on the host deposit.

Uses & applications

Used for jewelry, ornamental objects, and mineral collecting; this rough fragment appears primarily a collector specimen.

Geological facts

Smoky quartz is the same mineral as clear quartz, with color produced by defects in its crystal lattice rather than a different mineral composition.

Field identification & locations

Check for glassy luster, lack of cleavage, and ability to scratch glass; a hardness test or closer view of crystal faces would help confirm it. Quartz occurs worldwide, including Brazil, the Alps, and the United States.