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Onyx
Onyx

Boulder Opal
Boulder Opal



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Onyx
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Boulder Opal

Onyx and Boulder 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
2.55-2.70
1.98-2.25
1.5 Fracture
Not Available
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
1.6 Cleavage
Indiscernible
Not Available
1.7 Mohs Hardness
6.5-7
5-6.5
1.8 Chemical Composition
SiO2
SiO 2 + H 2OUlrich Henn and Claudio C.

Onyx and Boulder Opal Chemical Formula

While comparing Onyx and Boulder 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 Boulder Opal chemical formula.

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

Onyx and Boulder Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Onyx and Boulder Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Onyx and Boulder Opal Optical Properties during the identification of gemstone. Specific gravity of Onyx is 1.98-2.25 whereas that of Boulder Opal is 1.98-2.25.