Iolite and Hercynite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
4.39
  
Fracture
Not Available
  
ConchoidalGemdat.org, Uneven
  
Cleavage
3,1
  
{111} Indistinct, {111} Indistinct, {111} Indistinct
  
Mohs Hardness
7-7.5
  
7.5-8
  
Chemical Composition
Mg2Al4Si5O18
  
Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
  
Iolite and Hercynite Chemical Formula
While comparing Iolite and Hercynite 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 Hercynite chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
- Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Iolite and Hercynite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 4.39 whereas that of Hercynite is 4.39.