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Onyx
Onyx

Blue John
Blue John



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Onyx
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Blue John

Onyx and Blue John Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.55-2.70
3.00-3.25
1.5 Fracture
Not Available
Not Available
1.6 Cleavage
Indiscernible
Not Available
1.7 Mohs Hardness
6.5-7
Not Available
1.8 Chemical Composition
SiO2
CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Onyx and Blue John Chemical Formula

While comparing Onyx 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 Onyx and Blue John chemical formula.

  • Chemical formula of Onyx- SiO2
  • Chemical formula of Blue John- CaF 2Michael O’Donoghue , Gems, Sixth Edition (2006)

Onyx and Blue John Specific Gravity

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