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Turquoise
Turquoise

Blue John
Blue John



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Turquoise
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Blue John

Turquoise and Blue John Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
Soluble
-
2.30-2.90
Conchoidal
Good to perfect_usually N/A
5-6
CuAl6(PO4)4(OH)8 • 4H2O
 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Turquoise and Blue John Chemical Formula

While comparing Turquoise 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 Turquoise and Blue John chemical formula.

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Turquoise and Blue John Specific Gravity

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