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Falcons Eye
Falcons Eye

Blue John
Blue John



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Falcons Eye
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Blue John
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.58-2.64
-
-
7
SiO 2Walter Schumann , Gemstones of the world (2001)
 
-
-
-
3.00-3.25
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Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)