Shigaite and Star Ruby Physical Properties
Tenacity
Moderately flexible
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.32
  
3.95-4.10
  
Fracture
Flexible Flexible fragments.
  
Uneven, Uneven, Gems, Sixth Edition (2006)
  
Cleavage
Perfect on {0001}
  
Not Available
  
Mohs Hardness
2
  
Not Available
  
Chemical Composition
Not Available
  
Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Shigaite and Star Ruby Chemical Formula
While comparing Shigaite and Star 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 Shigaite and Star Ruby chemical formula.
>- Chemical formula of Star Ruby- Al 2O 3Michael OâDonoghue , Gems, Sixth Edition (2006)
Shigaite and Star Ruby Specific Gravity
Another important criteria for qualitative analysis of gemstones is Shigaite and Star Ruby Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Shigaite and Star Ruby Optical Properties during the identification of gemstone. Specific gravity of Shigaite is 3.95-4.10 whereas that of Star Ruby is 3.95-4.10.