Achroite and Blue John Physical Properties

Achroite and Blue John Chemical Formula

While comparing Achroite 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 Achroite and Blue John chemical formula.

• Chemical formula of Achroite- 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)

Achroite and Blue John Specific Gravity

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