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Cordierite and Gahnite Physical Properties


Gahnite and Cordierite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.57-2.66   
4.00-4.62   

Fracture
Subconchoidal, Conchoidal, Brittle   
Conchoidal, Uneven   

Cleavage
Fair on {100}, poor on {001} and {010}   
Indistinct parting on [111]   

Mohs Hardness
7-7.5   
7.5-8   

Chemical Composition
Mg2Al4Si5O18   
ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)   

Optical Properties >>
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Cordierite and Gahnite Chemical Formula

While comparing Cordierite and Gahnite 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 Gahnite chemical formula.

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Cordierite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.

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