Foitite and Ettringite Physical Properties

Foitite and Ettringite Chemical Formula

While comparing Foitite 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 Foitite and Ettringite chemical formula.

• Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
• Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael O’Donoghue , Gems, Sixth Edition (2006)

Foitite and Ettringite Specific Gravity

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