mineral

Smoky quartz vein fragment

Quartz, SiO₂ (likely smoky quartz)

AI-generated identification · may be incorrect

Brown to gray-brown, translucent in thinner areas, with a vitreous luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The rusty coating appears to be iron oxides.

Identified October 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed as silica-rich fluid deposited quartz in a rock fracture; the brown smoky color can result from natural radiation acting on trace aluminum. The image alone cannot establish its age or host rock.

Uses & applications

Quartz is used in glass, electronics, and abrasives; attractive pieces may be cut or collected, though this fragment appears mainly a field specimen.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms veins that cut through older rocks.

Field identification & locations

Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy appearance; quartz veins occur worldwide. The specimen is consistent with quartz, but confirmation would require testing.