Foitite and Sylvite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
3.17
  
1.993
  
Fracture
Handbook of mineralogy (2001)
  
Uneven, Brittle
  
Cleavage
None
  
Perfect on [100], [010], [001]
  
Mohs Hardness
7
  
2.5
  
Chemical Composition
Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
  
Not Available
  
Foitite and Sylvite Chemical Formula
While comparing Foitite 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 Foitite and Sylvite chemical formula.
- Chemical formula of Foitite- Na x[Fe2+2(Al,Fe3+ )]Al 6(BO 3) 3Si 6O 18(OH) 4Anthony et al , Handbook of mineralogy (2001)
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Foitite and Sylvite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Foitite and Sylvite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Foitite and Sylvite Optical Properties during the identification of gemstone. Specific gravity of Foitite is 1.993 whereas that of Sylvite is 1.993.