mineral
Smoky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown to grey or black coloration, vitreous luster, and trigonal crystal system with no true cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, brown to grey or black coloration, vitreous luster, and trigonal crystal system with no true cleavage.
Formation & geological history
Forms in igneous, metamorphic, and pegmatitic environments when surrounding natural radiation alters clear quartz.
Uses & applications
Commonly used in jewelry, lapidary arts, decorative carvings, and as a popular mineral specimen for collectors.
Geological facts
Its color is caused by free silicon formed from surrounding radioactive elements acting on the quartz crystal lattice.
Field identification & locations
Identified by its distinctive brown to smoky translucency and high quartz hardness; found globally in pegmatites.
