Kyanite and Variscite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.53-3.65
  
2.42-2.58
  
Fracture
Splintery, Brittle, Metallic
  
Conchoidal, Splintery, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle
  
Cleavage
[100] perfect [010] imperfect with 79° angle between
  
[010] perfect
  
Mohs Hardness
4-7
  
4-5
  
Chemical Composition
Not Available
  
AlPO4 · 2(H2O)
  
Kyanite and Variscite Chemical Formula
While comparing Kyanite and Variscite 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 Variscite chemical formula.
>- Chemical formula of Variscite- AlPO4 · 2(H2O)
Kyanite and Variscite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Variscite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Variscite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 2.42-2.58 whereas that of Variscite is 2.42-2.58.