Cordierite and Dumortierite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.57-2.66
  
3.26-3.41
  
Fracture
Subconchoidal, Conchoidal, Brittle
  
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
  
Cleavage
Fair on {100}, poor on {001} and {010}
  
Distinct on {100}, poor on {110}; parting on {001}
  
Mohs Hardness
7-7.5
  
7-8.5
  
Chemical Composition
Mg2Al4Si5O18
  
AlAl6O3BSi3O18
  
Cordierite and Dumortierite Chemical Formula
While comparing Cordierite and Dumortierite 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 and Dumortierite chemical formula.
- Chemical formula of Cordierite- Mg2Al4Si5O18
- Chemical formula of Dumortierite- AlAl6O3BSi3O18
Cordierite and Dumortierite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite and Dumortierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Dumortierite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.26-3.41 whereas that of Dumortierite is 3.26-3.41.