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Alexandrite
Alexandrite

Blue John
Blue John



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Alexandrite
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Blue John

Alexandrite and Blue John Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.69-3.813.00-3.25
Amber
1 7.18
1.5 Fracture
Not Available
Not Available
1.6 Cleavage
1,1 ; 3,2.
Not Available
1.7 Mohs Hardness
8.5Not Available
Amber
2 10
1.8 Chemical Composition
BeAl 2 O 4
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Alexandrite and Blue John Chemical Formula

While comparing Alexandrite 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 Alexandrite and Blue John chemical formula.

  • Chemical formula of Alexandrite- BeAl 2 O 4
  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Alexandrite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.