Fayalite and Sillimanite Physical Properties

Fayalite and Sillimanite Chemical Formula

While comparing Fayalite and Sillimanite 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 Fayalite and Sillimanite chemical formula.

• Chemical formula of Fayalite- Fe 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Fayalite and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Fayalite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Fayalite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Fayalite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.