Sillimanite and Chromite Physical Properties
Tenacity
Tough
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.20-3.26
  
4.5-4.8
  
Fracture
Splintery
  
Uneven
  
Cleavage
{010} perfect
  
None, parting may develop along {111}
  
Mohs Hardness
6-7.5
  
5.5
  
Chemical Composition
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Fe++Cr2O4
  
Sillimanite and Chromite Chemical Formula
While comparing Sillimanite and Chromite 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 Chromite chemical formula.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Chromite- Fe++Cr2O4
Sillimanite and Chromite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sillimanite and Chromite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Chromite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 4.5-4.8 whereas that of Chromite is 4.5-4.8.