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

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
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.