Blue John and Zircon Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
insoluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.00-3.25
  
3.93-4.73
  
Fracture
Not Available
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Not Available
  
{110} and {111}
  
Mohs Hardness
Not Available
  
7.5
  
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
ZrSiO4
  
Blue John and Zircon Chemical Formula
While comparing Blue John and Zircon 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 Blue John and Zircon chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Zircon- ZrSiO4
Blue John and Zircon Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Zircon Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Zircon Optical Properties during the identification of gemstone. Specific gravity of Blue John is 3.93-4.73 whereas that of Zircon is 3.93-4.73.