Umbalite and Iolite Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.62-4.33
  
2.6-2.7
  
Fracture
Uneven, Uneven, ConchoidalGemdat.org, Management Team (2012)
  
Not Available
  
Cleavage
Not Available
  
3,1
  
Mohs Hardness
7-7.5
  
7-7.5
  
Chemical Composition
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
  
Mg2Al4Si5O18
  
Umbalite and Iolite Chemical Formula
While comparing Umbalite and Iolite 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 Umbalite and Iolite chemical formula.
- Chemical formula of Umbalite- Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
- Chemical formula of Iolite- Mg2Al4Si5O18
Umbalite and Iolite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Umbalite and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Umbalite and Iolite Optical Properties during the identification of gemstone. Specific gravity of Umbalite is 2.6-2.7 whereas that of Iolite is 2.6-2.7.