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: Safe
Chemical Attack: Hydrofluoric Acid attacks quickly. Impurities may react to other acids
Light Sensitivity: Stable
Heat Sensitivity: Can Crack, Fade and Cleave


  • 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.