http://www.all-gemstones.com www.all-gemstones.com    Thu, 06 May 2010 12:29:47 +0000 http://wordpress.org/?v=2.8.6 en hourly 1 http://www.all-gemstones.com/amazonite http://www.all-gemstones.com/amazonite#comments Mon, 27 Jul 2009 05:57:02 +0000 admin http://www.all-gemstones.com/?p=384   Refractive Index : 1.530 – 1.522 (+0.004 – 0.004) Optical Characteristic : DR Biaxial negative , usually AGG reaction Specific Gravity : 2.56 (+ 0.02 – 0.02) Formula : KAlSi3O8 Crystal System : Triclinic Variety/Species : Microcline Feldspar Species/Group : Feldspar Group Birefringence : 0.008 Dispersion : None Hardness : 6 to 6.5 Toughness : Poor Ultrasonic : Never Steam : Never UV Long : Inert to weak yellowish green UV Short : Inert Pleochroism : None Strength : N/A

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Pleochroism Colors : None Heat : Avoid heating Acids : Attacked by acids and/or chemicals Light : Stable Polish Luster : Vitreous to greasy Fracture : Uneven to splintery Fracture Luster : Vitreous to pearly Clarity Type : N/A Tones : N/A Saturations : N/A Cause of Color : Lead and water color centers Enhancements :                                                                                                                                                                              Wax impregnation – This hides the cleavage cracks that break the surface. It can be detected through hot point test and infrared spectroscopy. This treatment is moderately stable.Irradiation – This treatment produces blue amazonite from white amazonite and is usually not detectable. It is very stable. Cleavage : Perfect and easy in 2 directions. Color Range : Light green, green, greenish blue, white, orange, pink, pinkish, orany, greenish, bluish, whitish sometimes light orange to pink Transparency : Semitranslucent to opaque Phenomena : Aventurescence, (rare), Schiller effect

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Separations : Amazonite from-
Chalcedony: RI, appearance, fracture/cleavage, SG (possibly).                                                         Turquoise: RI, appearance, spectrum.                                                                                                Aventurine quartz: RI, appearance, fracture/cleavage, SG. Identifying Characteristics and information
Dyed green and dyed blue amazonite gemstones appear red or pinkish through a chelsea filter.Occasionally has a faint sheen.Spot RI is usually 1.522 – 1.530 ( +/-.004) Spectral Data
Not Diagnostic. Trade Names and Misnomers
Amazon jade (M)
Amazon Stone
Amazonite
Colorado jade (M)
Pike’s Peak jade (M) Sources Brazil, Madagascar, Norway, US, USSR. ]]> http://www.all-gemstones.com/amazonite/feed 0