Cordierite and Bertrandite Physical Properties

Cordierite

Bertrandite

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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

2.57-2.662.59-2.60

1 7.18

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Brittle, Metallic, Brittle, Metallic

1.6 Cleavage

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

{001} Perfect, {110} Distinct, {101} Distinct

1.7 Mohs Hardness

7-7.56-7

2 10

1.8 Chemical Composition

Mg2Al4Si5O18

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Cordierite and Bertrandite Chemical Formula

While comparing Cordierite and Bertrandite 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 Bertrandite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Cordierite and Bertrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.