Sapphire and Spinel Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.03
  
3.64-3.66
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
None, but may exhibit parting
  
None, but may exhibit slight parting
  
Mohs Hardness
9
  
8
  
Chemical Composition
Al 2 O 3
  
MgAl2O4
  
Sapphire and Spinel Chemical Formula
While comparing Sapphire and Spinel 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 Sapphire and Spinel chemical formula.
- Chemical formula of Sapphire- Al 2 O 3
- Chemical formula of Spinel- MgAl2O4
Sapphire and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sapphire and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Spinel Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 3.64-3.66 whereas that of Spinel is 3.64-3.66.
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