Shungite and Sard Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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2.58-2.63
  
Fracture
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ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
  
Cleavage
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Mohs Hardness
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6.5-7
  
Chemical Composition
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SiO 2Ulrich Henn and Claudio C.
  
Shungite and Sard Chemical Formula
While comparing Shungite and Sard 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 Shungite and Sard chemical formula.
>- Chemical formula of Sard- SiO 2Ulrich Henn and Claudio C.
Shungite and Sard Specific Gravity
Another important criteria for qualitative analysis of gemstones is Shungite and Sard Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Shungite and Sard Optical Properties during the identification of gemstone. Specific gravity of Shungite is 2.58-2.63 whereas that of Sard is 2.58-2.63.