mineral
Polished smoky quartz pendant (probable)
Quartz, SiO₂; smoky variety
AI-generated identification · may be incorrectPolished, translucent-to-opaque brown-gray stone with subtle banding; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no cleavage and conchoidal fracture. The pendant setting and lighting obscure diagnostic details, so the identification is provisional.
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Physical properties
Polished, translucent-to-opaque brown-gray stone with subtle banding; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no cleavage and conchoidal fracture. The pendant setting and lighting obscure diagnostic details, so the identification is provisional.
Formation & geological history
Smoky color develops when natural radiation affects trace aluminum in quartz; quartz forms in many igneous and hydrothermal settings, across a wide range of geological ages.
Uses & applications
Used as an ornamental gemstone in jewelry and collected as a polished specimen.
Geological facts
Smoky quartz is colored by irradiation rather than by a distinct brown mineral pigment; similar-looking stones can include agate, jasper, or other quartz varieties.
Field identification & locations
Quartz is widespread worldwide. Check translucency and hardness on an inconspicuous spot; appearance alone cannot confirm the stone or its locality.
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