Iolite and Hardystonite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.6-2.7
  
3.396-3.443
  
Fracture
Not Available
  
Brittle, Metallic
  
Cleavage
3,1
  
[001] good, [100] and [110] fair
  
Mohs Hardness
7-7.5
  
3-4
  
Chemical Composition
Mg2Al4Si5O18
  
Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
  
Iolite and Hardystonite Chemical Formula
While comparing Iolite and Hardystonite 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 Hardystonite chemical formula.
- Chemical formula of Iolite- Mg2Al4Si5O18
- Chemical formula of Hardystonite- Ca 2ZnSi 2O 7Anthony et al , Handbook of mineralogy (2001)
Iolite and Hardystonite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Iolite and Hardystonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Hardystonite Optical Properties during the identification of gemstone. Specific gravity of Iolite is 3.396-3.443 whereas that of Hardystonite is 3.396-3.443.