gemstone
Smoky Quartz
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown to black color, vitreous luster, trigonal crystal system, and no distinct cleavage.
Identified More gemstone →
Explore Smoky Quartz in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness of 7 on the Mohs scale, brown to black color, vitreous luster, trigonal crystal system, and no distinct cleavage.
Formation & geological history
Formed from hydrothermal solutions and igneous pegmatites when natural radiation activates color centers in quartz, often dating from Precambrian to Cenozoic eras.
Uses & applications
Widely used in jewelry making, ornamental carvings, and as a collectible metaphysical crystal.
Geological facts
Smoky quartz is the national gemstone of Scotland and was historically used for ceremonial jewelry and Scottish kilt pins.
Field identification & locations
Identified by its characteristic brownish transparency and conchoidal fracture; commonly found in Brazil, Madagascar, and the United States.
More like this
Other gemstone specimens
Ammolite
Ammolite (Biogenic Aragonite with trace elements; fossils of Placenticeras meeki and Placenticeras intercalare)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Amber
Succinite (Organic Gemstone)
mineral
Diamond and Gold Jewelry
Carbon (Diamond) / Au (Gold)
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone