Verdite and Sillimanite Physical Properties
Tenacity
Not Available
  
Tough
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.80-3.0
  
3.20-3.26
  
Fracture
Not Available
  
Splintery
  
Cleavage
{110} Good
  
{010} perfect
  
Mohs Hardness
3
  
6-7.5
  
Chemical Composition
NaFeS2•2(H2O)
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Verdite and Sillimanite Chemical Formula
While comparing Verdite 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 Verdite and Sillimanite chemical formula.
- Chemical formula of Verdite- NaFeS2•2(H2O)
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Verdite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Verdite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Verdite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Verdite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.