Dumortierite and Hollandite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.26-3.41
  
5.05
  
Fracture
Fibrous, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references
  
Brittle, Metallic
  
Cleavage
Distinct on {100}, poor on {110}; parting on {001}
  
Distinct / Good, Prismatic
  
Mohs Hardness
7-8.5
  
4-6
  
Chemical Composition
AlAl6O3BSi3O18
  
Ba(Mn++++,Mn++)8O16
  
Dumortierite and Hollandite Chemical Formula
While comparing Dumortierite and Hollandite 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 Dumortierite and Hollandite chemical formula.
- Chemical formula of Dumortierite- AlAl6O3BSi3O18
- Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Dumortierite and Hollandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Dumortierite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Dumortierite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Dumortierite is 5.05 whereas that of Hollandite is 5.05.