Cordierite and Gibbsite Physical Properties

Cordierite

Gibbsite

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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

2.35

1.5 Fracture

Subconchoidal, Conchoidal, Brittle

Fibrous, Difficult, Fibrous

1.6 Cleavage

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

{001} Perfect

1.7 Mohs Hardness

7-7.5

2.5-3

1.8 Chemical Composition

Mg2Al4Si5O18

Al(OH)3

Cordierite and Gibbsite Chemical Formula

While comparing Cordierite and Gibbsite 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 Gibbsite chemical formula.

Chemical formula of Cordierite- Mg2Al4Si5O18
Chemical formula of Gibbsite- Al(OH)3

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Cordierite and Gibbsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Cordierite and Gibbsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Cordierite and Gibbsite Optical Properties during the identification of gemstone. Specific gravity of Cordierite is 2.35 whereas that of Gibbsite is 2.35.