mineral
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brownish-gray to dark brown color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
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Physical properties
Hardness of 7 on the Mohs scale, brownish-gray to dark brown color, vitreous luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65
Formation & geological history
Forms in igneous, metamorphic, and sedimentary environments; commonly crystallizes from silica-rich hydrothermal fluids and pegmatites, often colored by natural irradiation of aluminum impurities.
Uses & applications
Used in jewelry, decorative items, oscillators in electronics, and silica glass manufacturing.
Geological facts
Smoky quartz is the national gemstone of Scotland and has been used historically for ornaments and protective amulets.
Field identification & locations
Identified by its distinct conchoidal fracture, lack of cleavage, hardness scratching glass easily, and characteristic smoky brown color. Found worldwide, particularly 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
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Septarian Pebble
Septarian nodule / Concretion
sedimentary