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Amazonite or Amazonstone
Amazonite is a gem variety of microcline feldspar, being potassium aluminium silicate. It is usually polished as a cabochon.
In common with other feldspar gems, it displays a schiller of coloured light, caused by inclusions or its crystal structure creating interference effects of light.
It is sometimes called amazonstone or amazon stone, possibly because one of its sources is Brazil, although not from the Amazon regions.

Colour:
Amazonite varies from bright verdigris green to a bluish green.

Characteristics
Chemical Composition and nameKAlSi3O8 - Potassium Aluminium Silicate
Hardness6 - 6.5
Specific Gravity2.56 - 2.58
Crystalline SystemTriclinic
Refractive Index1.522 - 1.530
Bi-refringence0.008
Optic SignNegative
Optical CharacterBiaxial

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