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Onyx
Onyx

Black Opal
Black Opal



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X
Onyx
X
Black Opal

Onyx and Black Opal 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
2.55-2.701.97-2.22
Amber
1 7.18
1.5 Fracture
Not Available
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Indiscernible
Not Available
1.7 Mohs Hardness
6.5-76-6.5
Amber
2 10
1.8 Chemical Composition
SiO2
SiO 2 + H 2OUlrich Henn and Claudio C.

Onyx and Black Opal Chemical Formula

While comparing Onyx and Black Opal 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 Black Opal chemical formula.

  • Chemical formula of Onyx- SiO2
  • Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Onyx and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Onyx is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.