Kyanite and Wulfenite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.53-3.65
  
6.50-7.00
  
Fracture
Splintery, Brittle, Metallic
  
Irregular, Brittle, Conchoidal
  
Cleavage
[100] perfect [010] imperfect with 79° angle between
  
On {011}, distinct; on {001}, {013}, indistinct
  
Mohs Hardness
4-7
  
3
  
Chemical Composition
Not Available
  
PbMoO 4Walter Schumann , Gemstones of the world (2001)
  
Kyanite and Wulfenite Chemical Formula
While comparing Kyanite and Wulfenite 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 Wulfenite chemical formula.
>- Chemical formula of Wulfenite- PbMoO 4Walter Schumann , Gemstones of the world (2001)
Kyanite and Wulfenite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Kyanite and Wulfenite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Wulfenite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 6.50-7.00 whereas that of Wulfenite is 6.50-7.00.