Light Smoky Quartz

  • Strunz classification: 04.DA.05
  • Dana classification:
  • Crystal system: α-quartz: trigonal trapezohedral class 3 2; β-quartz: hexagonal 622
  • Space group: Trigonal 32
  • Unit cell: a = 4.9133 Å · c = 5.4053 Å; Z=3
  • Colour: Brown to grey, opaque


Smoky quartz is a brownish grey, translucent variety of quartz that ranges in clarity from almost complete transparency to an almost-opaque brownish-gray or black crystal. Like other quartz gems, it is a silicon dioxide crystal. The smoky colour results from free silicon formed from the silicon dioxide by natural irradiation.


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