Ettringite and Blue John Physical Properties

Ettringite and Blue John Chemical Formula

While comparing Ettringite 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 Ettringite and Blue John chemical formula.

• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Ettringite and Blue John Specific Gravity

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