Bytownite and Blue John Physical Properties

Bytownite and Blue John Chemical Formula

While comparing Bytownite 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 Bytownite and Blue John chemical formula.

• Chemical formula of Bytownite- Ca(70-90%)Na(30-10%)(Al,Si)AlSi 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Bytownite and Blue John Specific Gravity

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