Shungite and Astrophyllite Physical Properties
Tenacity
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Solubility
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Durability
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Specific Gravity
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3.2-3.4
  
Fracture
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Uneven, Brittle, Metallic
  
Cleavage
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Perfect on [001] imperfect on [100]
  
Mohs Hardness
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3
  
Chemical Composition
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(K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
  
Shungite and Astrophyllite Chemical Formula
While comparing Shungite and Astrophyllite 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 Astrophyllite chemical formula.
>- Chemical formula of Astrophyllite- (K,Na) 3(Fe2+ ,Mn) 7Ti 2Si 8O 24(O,OH) 7Anthony et al , Handbook of mineralogy (2001)
Shungite and Astrophyllite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Shungite and Astrophyllite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Shungite and Astrophyllite Optical Properties during the identification of gemstone. Specific gravity of Shungite is 3.2-3.4 whereas that of Astrophyllite is 3.2-3.4.