Cordierite and Vivianite Physical Properties
Tenacity
Brittle
  
Not Available
  
Solubility
Not Available
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
2.57-2.66
  
2.64-2.70
  
Fracture
Subconchoidal, Conchoidal, Brittle
  
(e.g. graphite).
  
Cleavage
Fair on {100}, poor on {001} and {010}
  
{010} Perfect
  
Mohs Hardness
7-7.5
  
Not Available
  
Chemical Composition
Mg2Al4Si5O18
  
Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
  
Cordierite and Vivianite Chemical Formula
While comparing Cordierite and Vivianite 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 Cordierite and Vivianite chemical formula.
- Chemical formula of Cordierite- Mg2Al4Si5O18
- Chemical formula of Vivianite- Fe 3(PO 4) 2 8H 2OUlrich Henn and Claudio C.
Cordierite and Vivianite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Cordierite and Vivianite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Vivianite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.64-2.70 whereas that of Vivianite is 2.64-2.70.