Sillimanite and Rossmanite Physical Properties

Sillimanite and Rossmanite Chemical Formula

While comparing Sillimanite and Rossmanite 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 Rossmanite chemical formula.

• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Rossmanite- ◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Sillimanite and Rossmanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Rossmanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Rossmanite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3 whereas that of Rossmanite is 3.