Serpentine Gemstone 25.27ct Afghanistan
This Serpentine is Natural Gemstone Which is Green Color, it’s Originates From Afghanistan and it’s Exact Weight is 25.27ct,The Measurements are 17.96×15.47×9.15mm, The Shape and Cut of this Stone is Rectangle Cabochon. It’s Graded Translucent and Clarity is Good. This 25.27ctGreen Natural Serpentine Gem is available for Ready to Ship anywhere in The World. You Can also Select Certification and Shipment Method as Optional.
Serpentine Gemstone 25.27ct
Properties Of Serpentine
Chemical Composition: Mg6[(OH)8lSi4O10]; Basic magnesium silicate
Hardness: 2.5 to 5.5
Specific Gravity (Density): 2.44 to 2.62
Refractive Index: 1.560 to 1.571
About: Serpentine Gemstone
There are two aggregate structures for serpentine(Latin-snake), leafy antigorite (leafy serpentine) and fibrous chrysotile. Very finely fibrous varieties are called asbestos. It has a greasy to silky luster and is sensitive to acids. Colors are often spotty. Minerals once classed as members of the serpentine group now find themselves in the kaolinite serpentine group which comprises hexagonal, trigonal, orthorhombic, monoclinic or triclinic silicates with the general composition M23 Z2O5(OH)4nH2O where M Al, Fe3, Fe2, Mg, Mn2, Ni, Zn; Z Al, Fe2, Si. Bowenite is antigorite as are the minerals for which the name serpentine has long been in general nonspecific use. Kaolinite serpentine group minerals are polished primarily for their attractive patterning though some may be intended to resemble the jade minerals nephrite and jadeite. Distinction is not too difficult by gemological testing as both nephrite and jadeite have SG (3.0 and 3.3 respectively) higher than kaolinite serpentine minerals. Using the validated names of today antigorite, clinochrysotile, and lizardite the SG and RI range for antigorite is 2.61, 1.560 1.571 respectively with birefringence 0.014. For clinochrysotile RI is 2.53 2.55 and 1.545 1.569, birefringence 0.001. For lizardite, RI is 1.546 1.560, birefringence 0.008.