Cordierite Iolite and Gahnite Physical Properties

Cordierite Iolite

Gahnite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.56-2.664.00-4.62

1 7.18

1.5 Fracture

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

Conchoidal, Uneven

1.6 Cleavage

Not Available

Indistinct parting on [111]

1.7 Mohs Hardness

7-7.57.5-8

2 10

1.8 Chemical Composition

Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.

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

Cordierite Iolite and Gahnite Chemical Formula

While comparing Cordierite Iolite 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 Iolite and Gahnite chemical formula.

Chemical formula of Cordierite Iolite- Mg 2Al 4Si 5O 18Ulrich Henn and Claudio C.
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite Iolite and Gahnite Specific Gravity

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