Prehnite and Kyanite Physical Properties
Tenacity
Brittle
  
Brittle
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.80-2.95
  
3.53-3.65
  
Fracture
Uneven, Yellow, White, UnevenWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Metallic
  
Splintery, Brittle, Metallic
  
Cleavage
Distinct on [001]
  
[100] perfect [010] imperfect with 79° angle between
  
Mohs Hardness
6-6.5
  
4-7
  
Chemical Composition
Ca2Al2Si3O12(OH)
  
Not Available
  
Prehnite and Kyanite Chemical Formula
While comparing Prehnite and Kyanite 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 Prehnite and Kyanite chemical formula.
- Chemical formula of Prehnite- Ca2Al2Si3O12(OH)
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Prehnite and Kyanite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Prehnite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Prehnite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Prehnite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.