mineral
Smoky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown to black coloration 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 coloration due to natural irradiation, vitreous luster, and trigonal crystal system with conchoidal fracture.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and igneous or metamorphic rocks through the irradiation of natural quartz over millions of years.
Uses & applications
Used widely in gemstone jewelry, ornamental carvings, and as a popular collector specimen.
Geological facts
Smoky quartz is the national gemstone of Scotland and was historically used to create protective amulets.
Field identification & locations
Easily identified by its distinct brown or grey translucency and quartz crystal habit; found globally with notable deposits in Brazil, Switzerland, and the US.
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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