Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
trigonalcommonSilicates
Smoky Quartz
SiO2
The image displays several well-formed, terminated smoky quartz crystals, exhibiting a dark brownish-gray to black color, possibly growing on a matrix.
Smoky Quartz Physical Properties
Mohs Hardness
7Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
noneFracture
conchoidalSpecific Gravity
2.65Colors
dark brown, gray, blackTransparency
translucentType Locality
North CarolinaMineral Group
SilicatesUses
jewelry, collector's specimens, metaphysicalAssociated Minerals
feldspar, mica, amethystRarity
commonGeological Context
Smoky quartz forms in igneous and metamorphic rocks, particularly in pegmatites and hydrothermal veins, often resulting from natural irradiation of aluminum impurities within the quartz lattice.
