Kyanite and Hyacinth Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.53-3.65
  
3.93-4.73
  
Fracture
Splintery, Brittle, Metallic
  
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
[100] perfect [010] imperfect with 79° angle between
  
Not Available
  
Mohs Hardness
4-7
  
6.5-7.5
  
Chemical Composition
Not Available
  
ZrSiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Kyanite and Hyacinth Chemical Formula
While comparing Kyanite and Hyacinth 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 Kyanite and Hyacinth chemical formula.
>- Chemical formula of Hyacinth- ZrSiO 4Michael OâDonoghue , Gems, Sixth Edition (2006)
Kyanite and Hyacinth Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Hyacinth Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Hyacinth Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 3.93-4.73 whereas that of Hyacinth is 3.93-4.73.