mineral
Smoky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown to black color due to natural irradiation, vitreous luster, and trigonal crystal system with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, brown to black color due to natural irradiation, vitreous luster, and trigonal crystal system with conchoidal fracture.
Formation & geological history
Forms in igneous, metamorphic, and pegmatitic environments when silicon dioxide is exposed to natural radiation from surrounding radioactive rocks over geological time.
Uses & applications
Widely used in jewelry, lapidary arts, and spiritual crystal collections.
Geological facts
Smoky quartz is the national gemstone of Scotland and has been used for protective amulets throughout history.
Field identification & locations
Easily identified by its brown coloration and high hardness; commonly found in pegmatites worldwide, notably in Brazil, the United States, and the Swiss Alps.
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Other mineral specimens
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous