Ettringite and Iolite Physical Properties

Ettringite and Iolite Chemical Formula

While comparing Ettringite and Iolite 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 Iolite 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 Iolite- Mg₂Al₄Si₅O₁₈

Ettringite and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Iolite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.6-2.7 whereas that of Iolite is 2.6-2.7.