Cordierite and Hollandite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.57-2.66
  
5.05
  
Fracture
Subconchoidal, Conchoidal, Brittle
  
Brittle, Metallic
  
Cleavage
Fair on {100}, poor on {001} and {010}
  
Distinct / Good, Prismatic
  
Mohs Hardness
7-7.5
  
4-6
  
Chemical Composition
Mg2Al4Si5O18
  
Ba(Mn++++,Mn++)8O16
  
Cordierite and Hollandite Chemical Formula
While comparing Cordierite 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 Cordierite and Hollandite chemical formula.
- Chemical formula of Cordierite- Mg2Al4Si5O18
- Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Cordierite and Hollandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 5.05 whereas that of Hollandite is 5.05.