Ruby and Pyrope Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
insoluble in water
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.97-4.05
  
3.62-3.87
  
Fracture
Conchoidal
  
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
  
Cleavage
No true cleavage
  
None
  
Mohs Hardness
9
  
7-7.5
  
Chemical Composition
Al 2 O 3
  
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
  
Ruby and Pyrope Chemical Formula
While comparing Ruby 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 Ruby and Pyrope chemical formula.
- Chemical formula of Ruby- Al 2 O 3
- Chemical formula of Pyrope- Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Ruby and Pyrope Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ruby and Pyrope Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Pyrope Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.62-3.87 whereas that of Pyrope is 3.62-3.87.
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