mineral

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely smoky variety with possible feldspar or matrix inclusions

AI-generated identification · may be incorrect

Translucent gray-brown to smoky crystal with vitreous luster and an apparent prismatic form; quartz hardness is 7 Mohs, has no cleavage, conchoidal fracture, and hexagonal crystal symmetry. The image is low-resolution, so the exact mineral mixture is uncertain.

Identified August 21, 2026More mineral →

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Physical properties

Formation & geological history

Smoky quartz forms in silica-rich hydrothermal veins, pegmatites, and cavities in igneous rocks; its color commonly results from natural irradiation affecting aluminum impurities. Individual specimens may range from modern growth to millions or billions of years old.

Uses & applications

Used as a collector specimen, ornamental stone, and occasionally in jewelry; lower-grade material has limited industrial value compared with clear quartz.

Geological facts

Quartz is one of Earth’s most abundant minerals and often forms six-sided prisms ending in pyramidal faces. Smoky coloration can fade with prolonged heating or intense sunlight.

Field identification & locations

Look for glassy luster, strong scratch resistance, lack of cleavage, and a hexagonal prism habit; a steel file should not scratch quartz. Common sources include Brazil, Madagascar, the Alps, Colorado, and North Carolina.