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Blue John
Blue John

Goethite
Goethite



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Blue John
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Goethite

Blue John and Goethite Physical Properties

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)
 
-
HCl soluble
-
4.27-4.29
Uneven
Perfect {010}
5-5.5
FeO(OH)Arthur Thomas , Gemstones (2009)

Blue John and Goethite Chemical Formula

While comparing Blue John and Goethite 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 Goethite chemical formula.

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Blue John and Goethite Specific Gravity

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