Sillimanite and Hardystonite Physical Properties

Sillimanite and Hardystonite Chemical Formula

While comparing Sillimanite and Hardystonite 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 Sillimanite and Hardystonite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)

Sillimanite and Hardystonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Hardystonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Hardystonite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.396-3.443 whereas that of Hardystonite is 3.396-3.443.