Iolite and Hollandite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
5.05
  
Fracture
Not Available
  
Brittle, Metallic
  
Cleavage
3,1
  
Distinct / Good, Prismatic
  
Mohs Hardness
7-7.5
  
4-6
  
Chemical Composition
Mg2Al4Si5O18
  
Ba(Mn++++,Mn++)8O16
  
Iolite and Hollandite Chemical Formula
While comparing Iolite 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 Iolite and Hollandite chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
- Chemical formula of Hollandite- Ba(Mn++++,Mn++)8O16
Iolite and Hollandite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Hollandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Hollandite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 5.05 whereas that of Hollandite is 5.05.