Tuesday, 28 May 2019

Chrysoberyl

Chrysoberyl is a hard, tough, and durable gem. Although lacking the fire of other gemstones, Chrysoberyl in its various forms can be quite valuable. Most Chrysoberyl gems are yellow, though some are brown, green, or orange. Chrysoberyl is best known for its important varieties Alexandrite and Cat"s Eye. Alexandrite is a rare and expensive form that exhibits different colors in natural and artificial light. Cat"s Eye is Chrysoberyl that is polished into a cabochon and highly chatoyant, displaying a sharp line of light through the center of the stone.


Chemical FormulaBeAl2O4
ColorRed, Green, Yellow, Orange, Brown, Pink, Gray, Black, Multicolored
Hardness8.5
Crystal SystemOrthorhombic
Refractive Index1.744Â -Â 1.755
SG3.5Â -Â 3.8
TransparencyTransparent to translucent
Double Refraction.009
LusterVitreous
Cleavage1,1 ; 3,2. Often exhibits parting along twinned crystals.
Mineral ClassChrysoberyl

No comments:

Post a Comment