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Smoky Quartz

Smoky Quartz is a brownish black to greyish color variety of quartz. Cairngorm is the Scottish term for smoky quartz

Gemological Information for Smoky Quartz

  
Color:Brown to Black or Smoky Grey
Crystal Structure:Hexagonal (Trigonal)
Refractive Index:1.544 to 1.553
Durability:Good
Hardness:7
Family:Quartz
Similar Stones:Andalusite, Tourmaline, Idocrase
Treatments:Quench Crackle, Irradiation, Heat Treatment and Coating or Backing
Country of Origin:Brazil, Scotland, India, Madagascar, Mexico, Srilanka, South Africa, Russia

Smoky Quartz Care

  
Ultrasonic Cleaning:Usually Safe
Steam Cleaning:Risky
Warm Soapy Water:Safe
Chemical Attack:Soluble in Hydrofluoric Acid and Ammonium Fluoride
Light Sensitivity:Usually Stable
Heat Sensitivity:May Fracture or Change Color

Sources

  • Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 187-190.
  • Newman, Harold. An Illustrated Dictionary of Jewelry, New York: Thames and Hudson, 1981. Pp. 283.
  • Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 116.