Cordierite Iolite and Sillimanite Physical Properties
Tenacity
Not Available
  
Tough
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.56-2.66
  
3.20-3.26
  
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Splintery
  
Cleavage
Not Available
  
{010} perfect
  
Mohs Hardness
7-7.5
  
6-7.5
  
Chemical Composition
Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
  
Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Cordierite Iolite and Sillimanite Chemical Formula
While comparing Cordierite Iolite 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 Cordierite Iolite and Sillimanite chemical formula.
- Chemical formula of Cordierite Iolite- Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
- Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Cordierite Iolite and Sillimanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite Iolite and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite Iolite and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Cordierite Iolite is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.