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