Opal and Ettringite Physical Properties

Opal and Ettringite Chemical Formula

While comparing Opal and Ettringite 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 Opal and Ettringite chemical formula.

• Chemical formula of Opal- SiO₂ · nH₂O
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Opal and Ettringite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Opal and Ettringite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Ettringite Optical Properties during the identification of gemstone. Specific gravity of Opal is 1.77 whereas that of Ettringite is 1.77.