Lawsonite and Blue John Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.09
  
3.00-3.25
  
Fracture
White, Yellow, Pale blue, Brittle, Uneven
  
Not Available
  
Cleavage
Perfect on {100} and {010}, imperfect on {101}
  
Not Available
  
Mohs Hardness
8
  
Not Available
  
Chemical Composition
Not Available
  
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Lawsonite and Blue John Chemical Formula
While comparing Lawsonite and Blue John 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 Lawsonite and Blue John chemical formula.
>- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Lawsonite and Blue John Specific Gravity
Another important criteria for qualitative analysis of gemstones is Lawsonite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Lawsonite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Lawsonite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.