Alexandrite and Kyanite Physical Properties

Alexandrite

Kyanite

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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

3.69-3.81

3.53-3.65

1.5 Fracture

Not Available

Splintery, Brittle, Metallic

1.6 Cleavage

1,1 ; 3,2.

[100] perfect [010] imperfect with 79° angle between

1.7 Mohs Hardness

8.5

4-7

1.8 Chemical Composition

BeAl ₂ O ₄

Not Available

Alexandrite and Kyanite Chemical Formula

While comparing Alexandrite and Kyanite 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 Kyanite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Alexandrite and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.