Black Opal and Riebeckite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.97-2.22
  
3.28-3.44
  
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Uneven, Splintery, Brittle
  
Cleavage
Not Available
  
Perfect on {110}, intersecting at 56° and 124°; partings on {100} and {010}
  
Mohs Hardness
6-6.5
  
5.0-6.0
  
Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
  
Not Available
  
Black Opal and Riebeckite Chemical Formula
While comparing Black Opal and Riebeckite 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 Black Opal and Riebeckite chemical formula.
- Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
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Black Opal and Riebeckite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Black Opal and Riebeckite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Riebeckite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 3.28-3.44 whereas that of Riebeckite is 3.28-3.44.