Blue John and Chalcedony Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.00-3.25
  
2.55-2.70
  
Fracture
Not Available
  
Uneven, Splintery, Conchoidal, Uneven, Splintery, Conchoidal, UnevenWalter Schumann
  
Cleavage
Not Available
  
Absent
  
Mohs Hardness
Not Available
  
6.5-7
  
Chemical Composition
CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
SiO2
  
Blue John and Chalcedony Chemical Formula
While comparing Blue John and Chalcedony 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 Chalcedony chemical formula.
- Chemical formula of Blue John- CaF 2Michael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Chalcedony- SiO2
Blue John and Chalcedony Specific Gravity
Another important criteria for qualitative analysis of gemstones is Blue John and Chalcedony Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Chalcedony Optical Properties during the identification of gemstone. Specific gravity of Blue John is 2.55-2.70 whereas that of Chalcedony is 2.55-2.70.