Alexandrite and Cordierite Physical Properties

Alexandrite

Cordierite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.812.57-2.66

1 7.18

1.5 Fracture

Not Available

Subconchoidal, Conchoidal, Brittle

1.6 Cleavage

1,1 ; 3,2.

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

1.7 Mohs Hardness

8.57-7.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Mg2Al4Si5O18

Alexandrite and Cordierite Chemical Formula

While comparing Alexandrite and Cordierite 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 Alexandrite and Cordierite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Cordierite- Mg2Al4Si5O18

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Alexandrite and Cordierite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Cordierite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Cordierite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.57-2.66 whereas that of Cordierite is 2.57-2.66.