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Blue John
Blue John

Turquoise
Turquoise



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Blue John
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Turquoise

Blue John and Turquoise Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.00-3.252.30-2.90
Amber
1 7.18
1.6 Fracture
Not Available
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
1.7 Cleavage
Not Available
Good to perfect_usually N/A
1.8 Mohs Hardness
Not Available5-6
Amber
2 10
1.9 Chemical Composition
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
CuAl6(PO4)4(OH)8 • 4H2O

Blue John and Turquoise Chemical Formula

While comparing Blue John and Turquoise 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 Turquoise chemical formula.

  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)
  • Chemical formula of Turquoise- CuAl6(PO4)4(OH)8 • 4H2O

Blue John and Turquoise Specific Gravity

Another important criteria for qualitative analysis of gemstones is Blue John and Turquoise Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Blue John and Turquoise Optical Properties during the identification of gemstone. Specific gravity of Blue John is 2.30-2.90 whereas that of Turquoise is 2.30-2.90.