Kyanite and Diopside Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.53-3.65
  
3.22-3.40
  
Fracture
Splintery, Brittle, Metallic
  
Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal
  
Cleavage
[100] perfect [010] imperfect with 79° angle between
  
Distinct/good on {110}
  
Mohs Hardness
4-7
  
5-6
  
Chemical Composition
Not Available
  
CaMgSi2O6
  
Kyanite and Diopside Chemical Formula
While comparing Kyanite and Diopside 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 Diopside chemical formula.
>- Chemical formula of Diopside- CaMgSi2O6
Kyanite and Diopside Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Diopside Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Diopside Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 3.22-3.40 whereas that of Diopside is 3.22-3.40.