Petalite and Blue John Physical Properties

Petalite and Blue John Chemical Formula

While comparing Petalite 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 Petalite and Blue John chemical formula.

• Chemical formula of Petalite- LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Petalite and Blue John Specific Gravity

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