Common Opal and Ettringite Physical Properties

Common Opal and Ettringite Chemical Formula

While comparing Common 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 Common Opal and Ettringite chemical formula.

• Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Common Opal and Ettringite Specific Gravity

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