Sylvite and Prehnite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Soluble
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.993
  
2.80-2.95
  
Fracture
Uneven, Brittle
  
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
  
Cleavage
Perfect on [100], [010], [001]
  
Distinct on [001]
  
Mohs Hardness
2.5
  
6-6.5
  
Chemical Composition
Not Available
  
Ca2Al2Si3O12(OH)
  
Sylvite and Prehnite Chemical Formula
While comparing Sylvite and Prehnite 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 Sylvite and Prehnite chemical formula.
>- Chemical formula of Prehnite- Ca2Al2Si3O12(OH)
Sylvite and Prehnite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Sylvite and Prehnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sylvite and Prehnite Optical Properties during the identification of gemstone. Specific gravity of Sylvite is 2.80-2.95 whereas that of Prehnite is 2.80-2.95.