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Blue John
Blue John

Spinel
Spinel



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Blue John
X
Spinel

Blue John and Spinel 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)
 
-
-
-
3.64-3.66
Conchoidal, Uneven
None, but may exhibit slight parting
8
MgAl2O4

Blue John and Spinel Chemical Formula

While comparing Blue John and Spinel 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 Spinel chemical formula.

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Blue John and Spinel Specific Gravity

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