Tourmaline Bi Color and Black Opal Physical Properties
Tenacity
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Not Available
  
Solubility
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Not Available
  
Durability
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Specific Gravity
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1.97-2.22
  
Fracture
Not Available
  
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
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Not Available
  
Mohs Hardness
7-7.5
  
6-6.5
  
Chemical Composition
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SiO 2 + H 2OUlrich Henn and Claudio C.
  
Tourmaline Bi Color and Black Opal Chemical Formula
While comparing Tourmaline Bi Color 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 Tourmaline Bi Color and Black Opal chemical formula.
>- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Tourmaline Bi Color and Black Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Tourmaline Bi Color and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Tourmaline Bi Color and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Tourmaline Bi Color is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.