Difference between revisions of "Amazonite"

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(edited addition from Shane Stewart (id:51))
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{{Amazonite}}
 
{{Amazonite}}
  
Amazonite is a variety of [[microcline]] ([[feldspar|K-feldspar]]) and has a green to blue green colour.
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Amazonite is a tradename for [[microcline]] ([[feldspar|K-feldspar]]) and has a green to blue green colour.
  
 
Microcline has the same chemical composition (KAlSi<sub>3</sub>O<sub>8</sub>) as [[orthoclase]], but it grows as triclinic crystals opposed to the monoclinic orthoclase.
 
Microcline has the same chemical composition (KAlSi<sub>3</sub>O<sub>8</sub>) as [[orthoclase]], but it grows as triclinic crystals opposed to the monoclinic orthoclase.

Revision as of 08:21, 28 June 2007

Amazonite
Chemical composition Microcline feldspar
Crystal system Triclinic
Habit Massive
Hardness 6-6.5
Optic nature Biaxial -
Refractive index 1.522-1.530
Birefringence 0.008-0.010
Dispersion Low
Specific gravity 2.56
Lustre Vitreous

Amazonite is a tradename for microcline (K-feldspar) and has a green to blue green colour.

Microcline has the same chemical composition (KAlSi3O8) as orthoclase, but it grows as triclinic crystals opposed to the monoclinic orthoclase.


Sources

  • Gems sixth edition (2006) - Michael O'Donoghue ISBN 0750658568
  • Gemstones of the world, 3rd rev and exp edition (2006) - Walter Schuman ISBN 1402740166