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Phlogopite
Phlogopite

Blue John
Blue John



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Phlogopite
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Blue John

Phlogopite and Blue John Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
2.78-2.85
Uneven
Perfect basal (001)
2-2.5
KMg3(Si3Al)O10(F,OH)2
 
-
-
-
3.00-3.25
-
Perfect
-9999
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Phlogopite and Blue John Chemical Formula

While comparing Phlogopite 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 Phlogopite and Blue John chemical formula.

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Phlogopite and Blue John Specific Gravity

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