Amazonite

Big Photo

Brazil
2.93 carats
© gemselect.com

Amazonite is green, blue-green gem variety of Microcline. It was named after Amazon River, from which certain green stones were formerly obtained, however it is doubtful whether Amazonite occurs in the Amazon area.

Amazonite Gemstones by Colour

This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
 
 
 
 

Amazonite Gemstones by Size

This table shows distribution of Amazonite gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.31 cts
Heaviest:33.86 cts
Average:10.59 cts
Total photos:28
Do you have a larger Amazonite? Why not upload a photo?
0.31ct to 3.67ct3.67ct to 7.02ct7.02ct to 10.38ct10.38ct to 13.73ct13.73ct to 17.09ct17.09ct to 20.44ct20.44ct to 23.80ct23.80ct to 27.15ct27.15ct to 30.51ct30.51ct to 33.86ct
General Information
A variety or type of:Microcline, which is a variety of Feldspar
Other Names/Trade Names:
Chemical Formula
KAlSi
 
3
O
 
8
Walter Schumann, Gemstones of the world (2001)
Photos of natural/un-cut material from mindat.org
Amazonite Treatments
Amazonite – colour is lost on heating to over 300°C and can be restored by irradiation if heating was insufficient (500°C) to cause water loss.

Often dyed (uniform color), impregnated with wax or coated with plastic (scratch test, hot point test) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 8
Physical Properties of Amazonite
Mohs Hardness6 to 6.5
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Specific Gravity2.55 to 2.57
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
TenacityBrittle
Walter Schumann, Gemstones of the world (2001)
Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
FractureUneven,Conchoidal
Michael O’Donoghue, Gems, Sixth Edition (2006)
Optical Properties of Amazonite
Refractive Index1.522 to 1.530
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Optical CharacterBiaxial/-
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Birefringence0.008 to 0.010
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
PleochroismWeak
Michael O’Donoghue, Gems, Sixth Edition (2006)
DispersionWeak
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Green, blue-green
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TransparencyTranslucent,Opaque
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010) Opaque with white grid-like pattern, rarely translucentMore from other references
LustreVitreous
Walter Schumann, Gemstones of the world (2001)
Fluorescence & other light emissions
Fluorescence (General)Weak; olive-green
Walter Schumann, Gemstones of the world (2001)
Fluorescence (Short Wave UV)Some amazonite will fluoresce medium or
weak red
Michael O’Donoghue, Gems, Sixth Edition (2006)
Fluorescence (Long-Wave UV)Possible yellow-green
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
Crystallography of Amazonite
Crystal SystemTriclinic
Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
More from other references
HabitPrismatic
Walter Schumann, Gemstones of the world (2001)
Further Information
Mineral information:Amazonite information at mindat.org
Significant Gem Localities
Madagascar
 
  • Mahajanga Province (Majunga)
    • Betsiboka Region
      • Tsaratanàna District
        • Ambakireny Commune
Madagascar, extraLapis English No.1, 2001, p. 43
Myanmar
 
  • Mandalay Region
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyatpyin North
Ted Themelis (2008) Gems & mines of Mogok
Peru
 
  • Huancavelica Department
    • Huancavelica Province
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