Rossmanite and Sillimanite Physical Properties

Rossmanite and Sillimanite Chemical Formula

While comparing Rossmanite 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 Rossmanite and Sillimanite chemical formula.

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

Rossmanite and Sillimanite Specific Gravity

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