Alexandrite and Poudretteite Physical Properties

Alexandrite

Poudretteite

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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

3.69-3.812.51-2.53

1 7.18

1.5 Fracture

Not Available

Conchoidal, Splintery

1.6 Cleavage

1,1 ; 3,2.

None

1.7 Mohs Hardness

8.55

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Alexandrite and Poudretteite Chemical Formula

While comparing Alexandrite and Poudretteite 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 Poudretteite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Alexandrite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.