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Blue John
Blue John

Gypsum
Gypsum



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Blue John
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Gypsum

Blue John and Gypsum 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)
 
Flexible
Soluble
-
2.20-2.40
Conchoidal, Splintery, Fibrous
Perfect on {010}, distinct on {100}
2
CaSO 4 -2(H 2O)Arthur Thomas , Gemstones (2009)

Blue John and Gypsum Chemical Formula

While comparing Blue John and Gypsum 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 Gypsum chemical formula.

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Blue John and Gypsum Specific Gravity

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