Cordierite and Allanite Physical Properties

Cordierite

Allanite

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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

2.57-2.66

3.40-4.20

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Not Available

1.6 Cleavage

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

Not Available

1.7 Mohs Hardness

7-7.5

Not Available

1.8 Chemical Composition

Mg2Al4Si5O18

Not Available

Cordierite and Allanite Chemical Formula

While comparing Cordierite and Allanite 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 Allanite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18

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Cordierite and Allanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Allanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Allanite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 3.40-4.20 whereas that of Allanite is 3.40-4.20.