Ettringite and Umbalite Physical Properties

Ettringite and Umbalite Chemical Formula

While comparing Ettringite and Umbalite 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 Umbalite 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 Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)

Ettringite and Umbalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ettringite and Umbalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Umbalite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 3.62-4.33 whereas that of Umbalite is 3.62-4.33.