Pargasite and Tortoiseshell Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
3.04-3.26
  
1.25-1.35
  
Fracture
Splintery, Brittle, Uneven
  
Not Available
  
Cleavage
{110} perfect
  
Not Available
  
Mohs Hardness
5-6
  
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Chemical Composition
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
  
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Pargasite and Tortoiseshell Chemical Formula
While comparing Pargasite and Tortoiseshell 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 Pargasite and Tortoiseshell chemical formula.
- Chemical formula of Pargasite- NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)
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Pargasite and Tortoiseshell Specific Gravity
Another important criteria for qualitative analysis of gemstones is Pargasite and Tortoiseshell Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Pargasite and Tortoiseshell Optical Properties during the identification of gemstone. Specific gravity of Pargasite is 1.25-1.35 whereas that of Tortoiseshell is 1.25-1.35.