mineral

Smoky quartz crystal fragment

Quartz (SiO₂), smoky variety

AI-generated identification · may be incorrect

Brown to gray, translucent-to-opaque crystal with a vitreous luster and conchoidal fracture; Mohs hardness 7, hexagonal crystal system, and no cleavage. The visible faces and color are consistent with a rough, fractured quartz specimen.

Identified October 4, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms as silica-rich fluids cool in veins and cavities, or crystallizes from magma; smoky coloration usually results from natural irradiation acting on trace aluminum. Quartz occurs across many geological ages and settings.

Uses & applications

Quartz is used in glass, electronics, and jewelry; attractive smoky crystals are collected or cut into gemstones.

Geological facts

Smoky quartz’s color can range from pale gray to nearly black, and may fade with prolonged exposure to strong sunlight.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch glass, and absence of cleavage; common sources include Brazil, the Alps, and the western United States. The photo suggests quartz, though a close view or simple hardness test would help confirm it.