Lazurite and Sillimanite Physical Properties

Lazurite and Sillimanite Chemical Formula

While comparing Lazurite 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 Lazurite and Sillimanite chemical formula.

• Chemical formula of Lazurite- (Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
• Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

Lazurite and Sillimanite Specific Gravity

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