Kashmir sapphire and Sillimanite Physical Properties
Tenacity
Not Available
  
Tough
  
Solubility
Not Available
  
Not Available
  
Durability
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Not Available
  
Specific Gravity
Not Available
  
3.20-3.26
  
Fracture
Not Available
  
Splintery
  
Cleavage
Not Available
  
{010} perfect
  
Mohs Hardness
Not Available
  
6-7.5
  
Chemical Composition
Not Available
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Kashmir sapphire and Sillimanite Chemical Formula
While comparing Kashmir sapphire 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 Kashmir sapphire and Sillimanite chemical formula.
>- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Kashmir sapphire and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kashmir sapphire and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kashmir sapphire and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Kashmir sapphire is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.