Vivianite and Polyhalite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Not Available
  
Soluble
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.64-2.70
  
2.78
  
Fracture
(e.g. graphite).
  
Conchoidal, Brittle
  
Cleavage
{010} Perfect
  
Perfect on {10 1 }; parting on {010}
  
Mohs Hardness
Not Available
  
3.5
  
Chemical Composition
Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
  
Not Available
  
Vivianite and Polyhalite Chemical Formula
While comparing Vivianite and Polyhalite 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 Vivianite and Polyhalite chemical formula.
- Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
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Vivianite and Polyhalite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Vivianite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Vivianite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Vivianite is 2.78 whereas that of Polyhalite is 2.78.