mineral
Smoky quartz chips
Quartz, SiO₂ (smoky variety)
AI-generated identification · may be incorrectTypically translucent gray-brown to nearly black, with a vitreous luster, conchoidal fracture, and no cleavage; Mohs hardness 7, hexagonal crystal structure, specific gravity about 2.65. The pieces appear rough and possibly tumbled or broken, with some iron-oxide staining.
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Physical properties
Typically translucent gray-brown to nearly black, with a vitreous luster, conchoidal fracture, and no cleavage; Mohs hardness 7, hexagonal crystal structure, specific gravity about 2.65. The pieces appear rough and possibly tumbled or broken, with some iron-oxide staining.
Formation & geological history
Forms in silica-rich hydrothermal veins, granite pegmatites, and cavities of felsic igneous rocks; smoky color commonly results from natural irradiation of aluminum-bearing quartz. Individual crystals may range from recent deposits to Precambrian formations, depending on locality.
Uses & applications
Used as a decorative and collectible mineral, cabochon or gemstone, and occasionally in carvings; quartz is also essential in glass, electronics, abrasives, and construction aggregate.
Geological facts
Smoky quartz can fade with strong heat or prolonged sunlight, while very dark material may be called morion. It is distinct from brown glass because it scratches glass and lacks bubbles or flow texture.
Field identification & locations
Identify by hardness, glassy luster, lack of cleavage, and six-sided crystal remnants; common sources include Brazil, Switzerland, the United States, Madagascar, and Scotland. The image alone cannot confirm the variety conclusively.
