mineral

Likely rough smoky quartz

Quartz, SiO₂ (smoky variety)

AI-generated identification · may be incorrect

Brown-gray, translucent edges, vitreous luster, and irregular/conchoidal fracture are visible. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65; the image does not show enough detail to confirm the identification.

Identified September 29, 2026More mineral →

Explore Likely rough smoky quartz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Smoky quartz forms in silica-rich veins and cavities as mineral-bearing fluids cool; its brown color commonly results from natural irradiation acting on trace aluminum. It occurs in rocks of many geological ages.

Uses & applications

Used as a gemstone, in carvings and collections; quartz also has extensive industrial use in glass, electronics, and abrasives.

Geological facts

Quartz is one of Earth’s most abundant minerals. A scratch test on an inconspicuous spot and inspection for glassy conchoidal fracture can help distinguish it from softer brown minerals.

Field identification & locations

Common localities include Brazil, the Alps, Madagascar, and the United States. This small rough piece appears consistent with quartz, but color alone cannot establish that it is smoky quartz.