List of Gemstones | Rare Minerals | Gem stones | Gems » Silver Peak jade 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 Malachite http://www.all-gemstones.com/malachite http://www.all-gemstones.com/malachite#comments Tue, 18 Aug 2009 05:39:05 +0000 admin http://www.all-gemstones.com/?p=988
Refractive Index : 1.909 – 1.655
Optical Characteristic : AGG
Specific Gravity : 3.95 (+0.15 – 0.70)
Formula : CuCO3(OH)2
Crystal System : Monoclinic
Variety/Species : All
Species/Group : Malachite
Birefringence : 0.254
Dispersion : N/A
Hardness : 3.5 to 4
Toughness : poor
Ultrasonic : Never
Steam : Never
UV Long : Inert
UV Short : Inert
Pleochroism : None
Strength : N/A
Pleochroism Colors : None
Heat : sensitive
Acids : Attacked by acids and/or chemicals
Light : Stable
Polish Luster : Silky to vitreous
Fracture : Uneven to splintery
Fracture Luster : Dull
Clarity Type : N/A
Tones : N/A
Saturations : N/A
Cause of Color : Copper
Enhancements : Impregnation
Cleavage : perfect in 1 direction.
Color Range : Vivid, slightly bluish green, banded in 2 tones (or more) of green; sometimes has a sheen.
Transparency : Opaque
Phenomena : Chatoyancy
Separations : malachite from-
Dyed onyx marble: RI, SG

Synthetic malachite (Russian): Generally can’t be separated from natural with standard gemological tests.
Identifying Characteristics and information
Curved banding sometimes forming “eyes.” Sometimes botryoidal. Has a light green streak. May have sheen. Avoid rough handling, heat, and chemicals.
Spectral Data
Not diagnostic.
Trade Names and Misnomers
Natural Malachite
Peacock Stone
Pseudo-Emerald (M)
Silver Peak jade (M)
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