Verdelite and Blue John Physical Properties

Verdelite and Blue John Chemical Formula

While comparing Verdelite and Blue John physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Verdelite and Blue John chemical formula.

• Chemical formula of Verdelite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Verdelite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Verdelite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Verdelite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Verdelite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.