Ettringite and Cordierite Physical Properties
Tenacity
Not Available
  
Brittle
  
Solubility
Partially soluble in water
  
Not Available
  
Durability
Not Available
  
Not Available
  
Specific Gravity
1.77
  
2.57-2.66
  
Fracture
Not Available
  
Subconchoidal, Conchoidal, Brittle
  
Cleavage
Perfect on {10 1 0}
  
Fair on {100}, poor on {001} and {010}
  
Mohs Hardness
2-2.5
  
7-7.5
  
Chemical Composition
Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
  
Mg2Al4Si5O18
  
Ettringite and Cordierite Chemical Formula
While comparing Ettringite and Cordierite 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 Ettringite and Cordierite chemical formula.
- Chemical formula of Ettringite- Ca 6Al 2(SO 4) 3(OH) 12 26H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
- Chemical formula of Cordierite- Mg2Al4Si5O18
Ettringite and Cordierite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Ettringite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ettringite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Ettringite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.