gemstone
Faceted smoky quartz
Quartz (SiO₂), likely smoky quartz
AI-generated identification · may be incorrectTransparent to translucent brown-green with a vitreous luster and conchoidal fracture; Mohs hardness 7, trigonal crystal structure, no cleavage. The heart-shaped cut and lighting make exact identification uncertain.
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Physical properties
Transparent to translucent brown-green with a vitreous luster and conchoidal fracture; Mohs hardness 7, trigonal crystal structure, no cleavage. The heart-shaped cut and lighting make exact identification uncertain.
Formation & geological history
Quartz forms in silica-rich veins and cavities as hot fluids cool; smoky color commonly results from natural irradiation acting on trace aluminum. Quartz occurs in rocks of many geological ages.
Uses & applications
Used in jewelry and ornamental carvings; quartz is also important in glassmaking and electronics.
Geological facts
Smoky quartz color ranges from pale gray-brown to nearly black and can fade with prolonged exposure to strong sunlight.
Field identification & locations
Look for hardness near 7, glassy luster, and lack of cleavage; common sources include Brazil, Madagascar, the Alps, and the United States. This polished heart cannot be reliably distinguished from other brown gemstones by image alone.
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