Crystal Opal and Ettringite Physical Properties

Crystal Opal and Ettringite Chemical Formula

While comparing Crystal 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 Crystal Opal and Ettringite chemical formula.

• Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Crystal Opal and Ettringite Specific Gravity

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