Image: <a href="//commons.wikimedia.org/w/index.php?title=User:Arkenstone-iRocks&action=edit&redlink=1" class="new" title="User:Arkenstone-iRocks (page does not exist)">Rob Lavinsky</a> (CC BY 3.0)
trigonalcommonSilicates
Smoky Quartz
SiO2
This specimen features an unusually well-balanced, totally gemmy, pristine, and incredibly sharply terminated central crystal on matrix, with superb equant form. It exhibits a dark, smoky color and a sharp internal phantom, which is rare for its location.
Smoky Quartz Physical Properties
Mohs Hardness
7Crystal System
trigonalLuster
vitreousStreak Color
whiteCleavage
noneFracture
conchoidalSpecific Gravity
2.65Colors
brown, grey-brown, blackTransparency
transparentType Locality
New Mexico, USAMineral Group
SilicatesUses
jewelry, collector, industrialAssociated Minerals
feldspar, mica, topaz, berylRarity
commonGeological Context
Smoky quartz forms in igneous and metamorphic rocks, as well as hydrothermal veins, often due to natural irradiation of aluminum-bearing quartz. It is commonly found in granites, pegmatites, and certain volcanic rocks.
