Shigaite and Spinel Physical Properties
Tenacity
Moderately flexible
  
Not Available
  
Solubility
Not Available
  
none
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.32
  
3.64-3.66
  
Fracture
Flexible Flexible fragments.
  
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
Perfect on {0001}
  
None, but may exhibit slight parting
  
Mohs Hardness
2
  
8
  
Chemical Composition
Not Available
  
MgAl2O4
  
Shigaite and Spinel Chemical Formula
While comparing Shigaite and Spinel 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 Spinel chemical formula.
>- Chemical formula of Spinel- MgAl2O4
Shigaite and Spinel Specific Gravity
Another important criteria for qualitative analysis of gemstones is Shigaite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Shigaite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Shigaite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.