Sapphire and Amethyst Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble
  
insoluble in common solvents
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.03
  
2.65
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001)
  
Cleavage
None, but may exhibit parting
  
Indiscernible
  
Mohs Hardness
9
  
7
  
Chemical Composition
Al 2 O 3
  
SiO2
  
Sapphire and Amethyst Chemical Formula
While comparing Sapphire and Amethyst 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 Amethyst chemical formula.
- Chemical formula of Sapphire- Al 2 O 3
- Chemical formula of Amethyst- SiO2
Sapphire and Amethyst Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sapphire and Amethyst Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Amethyst Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 2.65 whereas that of Amethyst is 2.65.
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