Shigaite and Pargasite Physical Properties
Tenacity
Moderately flexible
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.32
  
3.04-3.26
  
Fracture
Flexible Flexible fragments.
  
Splintery, Brittle, Uneven
  
Cleavage
Perfect on {0001}
  
{110} perfect
  
Mohs Hardness
2
  
5-6
  
Chemical Composition
Not Available
  
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Shigaite and Pargasite Chemical Formula
While comparing Shigaite and Pargasite 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 Pargasite chemical formula.
>- Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Shigaite and Pargasite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Shigaite and Pargasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Shigaite and Pargasite Optical Properties during the identification of gemstone. Specific gravity of Shigaite is 3.04-3.26 whereas that of Pargasite is 3.04-3.26.