Sapphire and Pyrope Physical Properties
Tenacity
Not Available
  
Not Available
  
Solubility
insoluble
  
insoluble in water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.95-4.03
  
3.62-3.87
  
Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Cleavage
None, but may exhibit parting
  
None
  
Mohs Hardness
9
  
7-7.5
  
Chemical Composition
Al 2 O 3
  
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  
Sapphire and Pyrope Chemical Formula
While comparing Sapphire and Pyrope 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 Pyrope chemical formula.
- Chemical formula of Sapphire- Al 2 O 3
- Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Sapphire and Pyrope Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sapphire and Pyrope Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Pyrope Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 3.62-3.87 whereas that of Pyrope is 3.62-3.87.
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