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Microcline

Amazonite in Albite Specimen. Photo: Rob Lavinsky, iRocks.com

Microcline is a mineral series in the feldspar group. Amazonite is a light green to greenish blue variety of Microcline. Sometimes falsely referred to as Colorado jade or Pike’s Peak jade, it often has grid-like white streaks and a faint sheen.

Gemological Information for Microcline

  
Color:Light Green, Greenish Blue
Crystal Structure:Triclinic
Refractive Index:1.522 to 1.530
Durability:Poor
Hardness:6 to 6.5
Family:Feldspar
Similar Stones:Aventurine Quartz, Chalcedony, Turquoise
Treatments:Wax Impregnation, Irradiation
Country of Origin:Brazil, Madagascar, Norway, US, Russia

Microcline Care

  
Ultrasonic Cleaning:Never
Steam Cleaning:Never
Warm Soapy Water:Never
Chemical Attack:Hydrofluoric Acid Attacks Quickly. Impurities May React to Other Acids
Light Sensitivity:Stable
Heat Sensitivity:Can Crack, Fade and Cleave

Sources

  • Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 101-107.
  • Newman, Harold. An Illustrated Dictionary of Jewelry, New York: Thames and Hudson, 1981. Pp. 122.
  • Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 164-167.