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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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1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.00-3.25
3.53-3.65
1.5 Fracture
Not Available
Splintery, Brittle, Metallic
1.6 Cleavage
Not Available
[100] perfect [010] imperfect with 79° angle between
1.7 Mohs Hardness
Not Available
4-7
1.8 Chemical Composition
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
Not Available

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.

  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
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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 and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Blue John is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.