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