Difference between revisions of "Amazonite"

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(Sources)
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==Sources==
 
==Sources==
  
* ''Gems sixth edition'' (2006) - Michael O'Donoghue ISBN 0750658568
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* [http://www.amazon.com/gp/product/0750658568?ie=UTF8&tag=gemsandwhywelove&link_code=as3&camp=211189&creative=373489&creativeASIN=0750658568 Gems Their Sources, Descriptions and Identification'' 4th Edition (1990) - Robert Webster (6th ed.)]
 
* ''Gemstones of the world, 3rd rev and exp edition'' (2006) - Walter Schuman ISBN 1402740166
 
* ''Gemstones of the world, 3rd rev and exp edition'' (2006) - Walter Schuman ISBN 1402740166

Revision as of 17:14, 1 June 2009

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