Kyanite and Alexandrite Physical Properties

Kyanite

Alexandrite

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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

3.53-3.653.69-3.81

1 7.18

1.5 Fracture

Splintery, Brittle, Metallic

Not Available

1.6 Cleavage

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

1,1 ; 3,2.

1.7 Mohs Hardness

4-78.5

2 10

1.8 Chemical Composition

Not Available

BeAl ₂ O ₄

Kyanite and Alexandrite Chemical Formula

While comparing Kyanite and Alexandrite 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 Kyanite and Alexandrite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄

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Kyanite and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Kyanite and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Kyanite and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Kyanite is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.