Sillimanite and Star Sapphire Physical Properties

Sillimanite and Star Sapphire Chemical Formula

While comparing Sillimanite and Star Sapphire 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 Star Sapphire chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Star Sapphire- Al 2O 3Ulrich Henn and Claudio C.

Sillimanite and Star Sapphire Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Star Sapphire Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Star Sapphire Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.90-4.05 whereas that of Star Sapphire is 3.90-4.05.