Cordierite and Gahnite Physical Properties

Cordierite

Gahnite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.664.00-4.62

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Conchoidal, Uneven

1.6 Cleavage

Fair on {100}, poor on {001} and {010}

Indistinct parting on [111]

1.7 Mohs Hardness

7-7.57.5-8

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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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.