Neptunite and Sylvite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.19-3.23
  
1.993
  
Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
  
Uneven, Brittle
  
Cleavage
{110} good
  
Perfect on [100], [010], [001]
  
Mohs Hardness
5-6
  
2.5
  
Chemical Composition
KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
  
Not Available
  
Neptunite and Sylvite Chemical Formula
While comparing Neptunite and Sylvite 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 Neptunite and Sylvite chemical formula.
- Chemical formula of Neptunite- KNa 2Li(Fe2+ ,Mn2+ ) 2Ti 2Si 8O 24Michael OâDonoghue , Gems, Sixth Edition (2006)
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Neptunite and Sylvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Neptunite and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Neptunite and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Neptunite is 1.993 whereas that of Sylvite is 1.993.