Iolite and Glass Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
2.39-4.00
  
Fracture
Not Available
  
ConchoidalGemdat.org, Management Team (2012), ConchoidalGemdat.org, Management Team (2012)
  
Cleavage
3,1
  
Not Available
  
Mohs Hardness
7-7.5
  
4-6
  
Chemical Composition
Mg2Al4Si5O18
  
Not Available
  
Iolite and Glass Chemical Formula
While comparing Iolite and Glass 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 Glass chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
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Iolite and Glass Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Glass Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Glass Optical Properties during the identification of gemstone. Specific gravity of Iolite is 2.39-4.00 whereas that of Glass is 2.39-4.00.