mineral
Smoky quartz crystal point
Quartz (SiO₂), likely smoky quartz
AI-generated identification · may be incorrectTranslucent brown to smoky gray, vitreous luster, hexagonal crystal habit; Mohs hardness 7, no cleavage, conchoidal fracture. The image appears to show a polished or shaped crystal point; color and exact variety are uncertain from the photo.
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Physical properties
Translucent brown to smoky gray, vitreous luster, hexagonal crystal habit; Mohs hardness 7, no cleavage, conchoidal fracture. The image appears to show a polished or shaped crystal point; color and exact variety are uncertain from the photo.
Formation & geological history
Quartz forms from silica-rich fluids or melts in veins and cavities, commonly during late-stage igneous activity and hydrothermal alteration. It occurs in rocks of many ages.
Uses & applications
Used for collecting, decoration, and jewelry; quartz also has major industrial uses in glassmaking and electronics.
Geological facts
Quartz is among Earth’s most abundant minerals and has a trigonal crystal structure within the hexagonal crystal system.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch glass, and a pointed prismatic form; smoky quartz occurs worldwide, notably in Brazil, Madagascar, and the Alps. The pictured specimen’s identity is tentative.
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