mineral

Smoky quartz crystal

Quartz (SiO₂), likely smoky quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent brown-gray color, vitreous luster, hexagonal crystal system, and no true cleavage. The specimen appears naturally terminated or broken, with internal cloudy inclusions.

Identified October 12, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent brown-gray color, vitreous luster, hexagonal crystal system, and no true cleavage. The specimen appears naturally terminated or broken, with internal cloudy inclusions.

Formation & geological history

Quartz crystallizes from silica-rich fluids in fractures and cavities, commonly in granitic pegmatites and hydrothermal veins. Its geological age cannot be determined from the image.

Uses & applications

Quartz is used in glass, electronics, and abrasives; attractive crystals are collected or used in jewelry and décor.

Geological facts

Smoky coloration usually results from irradiation affecting trace aluminum within quartz; heating can lighten or alter the color.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and six-sided prismatic crystals; common sources include Brazil, Madagascar, and the Alps. The image supports a quartz identification, but exact variety and locality are uncertain.