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Blue John
Blue John

Kyanite
Kyanite



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Blue John
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Kyanite

Blue John and Kyanite Physical Properties

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
Brittle
-
-
3.53-3.65
Splintery
[100] perfect [010] imperfect with 79° angle between
4-7
Al2SiO5

Blue John and Kyanite Chemical Formula

While comparing Blue John and Kyanite 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 Kyanite chemical formula.

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Blue John and Kyanite Specific Gravity

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