Cordierite and Poudretteite Physical Properties

Cordierite

Poudretteite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.57-2.662.51-2.53

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Conchoidal, Splintery

1.6 Cleavage

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

None

1.7 Mohs Hardness

7-7.55

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Poudretteite Chemical Formula

While comparing Cordierite and Poudretteite 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 Poudretteite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.