Cordierite and Augelite Physical Properties

Cordierite

Augelite

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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

2.57-2.662.70-2.75

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

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

From the Greek for luster, for its pearly luster on the cleavage.

1.7 Mohs Hardness

7-7.54.5-5

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)

Cordierite and Augelite Chemical Formula

While comparing Cordierite and Augelite 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 Augelite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Augelite- Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)

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Cordierite and Augelite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Augelite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Augelite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.70-2.75 whereas that of Augelite is 2.70-2.75.