Emerald and Crystal Opal Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Hard
  
Not Available
  
Specific Gravity
2.67-2.78
  
1.97-2.22
  
Fracture
Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Imperfect on the [0001]
  
Not Available
  
Mohs Hardness
7.5-8
  
5.5-6.5
  
Chemical Composition
Be3Al2SiO6
  
SiO 2 + H 2OUlrich Henn and Claudio C.
  
Emerald and Crystal Opal Chemical Formula
While comparing Emerald and Crystal 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 Emerald and Crystal Opal chemical formula.
- Chemical formula of Emerald- Be3Al2SiO6
- Chemical formula of Crystal Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
Emerald and Crystal Opal Specific Gravity
Another important criteria for qualitative analysis of gemstones is Emerald and Crystal Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Emerald and Crystal Opal Optical Properties during the identification of gemstone. Specific gravity of Emerald is 1.97-2.22 whereas that of Crystal Opal is 1.97-2.22.
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