Pargasite and Blue John Physical Properties

Pargasite and Blue John Chemical Formula

While comparing Pargasite 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 Pargasite and Blue John chemical formula.

• Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Pargasite and Blue John Specific Gravity

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