Sard and Polyhalite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.58-2.63
  
2.78
  
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Conchoidal, Brittle
  
Cleavage
Not Available
  
Perfect on {10 1 }; parting on {010}
  
Mohs Hardness
6.5-7
  
3.5
  
Chemical Composition
SiO 2Ulrich Henn and Claudio C.
  
Not Available
  
Sard and Polyhalite Chemical Formula
While comparing Sard and Polyhalite 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 Sard and Polyhalite chemical formula.
- Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.
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Sard and Polyhalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sard and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sard and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Sard is 2.78 whereas that of Polyhalite is 2.78.