Black Opal and Blue John Physical Properties

Black Opal and Blue John Chemical Formula

While comparing Black Opal 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 Black Opal and Blue John chemical formula.

• Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
• Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Black Opal and Blue John Specific Gravity

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