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Jet
Jet

Blue John
Blue John



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X
Jet
X
Blue John

Jet and Blue John Physical Properties

Jet
Jet
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.19-1.35
ConchoidalWalter Schumann
None
2.5-4
C
 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Jet and Blue John Chemical Formula

While comparing Jet 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 Jet and Blue John chemical formula.

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Jet and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Jet and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Jet Vs Blue John during the identification of gemstone. Specific gravity of Jet is whereas that of Blue John is .