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Cuprite
Cuprite

Blue John
Blue John



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Cuprite
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Blue John

Cuprite and Blue John Physical Properties

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Physical Properties

Tenacity

Brittle
-

Solubility

-
-

Durability

-
-

Specific Gravity

5.85-6.153.00-3.25
1 7.18
👆🏻

Fracture

Conchoidal
-

Cleavage

Fair in four directions forming octahedrons
Perfect

Mohs Hardness

3.5-4-9999
2 10
👆🏻

Chemical Composition

Cu 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Cuprite and Blue John Chemical Formula

While comparing Cuprite 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 Cuprite and Blue John chemical formula.

  • Chemical formula of Cuprite- Cu 2OMichael O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Cuprite and Blue John Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cuprite and Blue John Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cuprite and Blue John Optical Properties during the identification of gemstone. Specific gravity of Cuprite is 3.00-3.25 whereas that of Blue John is 3.00-3.25.