Alexandrite and Gibbsite Physical Properties

Alexandrite

Gibbsite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.69-3.812.35

1 7.18

1.5 Fracture

Not Available

Fibrous, Difficult, Fibrous

1.6 Cleavage

1,1 ; 3,2.

{001} Perfect

1.7 Mohs Hardness

8.52.5-3

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Al(OH)3

Alexandrite and Gibbsite Chemical Formula

While comparing Alexandrite 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 Alexandrite and Gibbsite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Gibbsite- Al(OH)3

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Alexandrite and Gibbsite Specific Gravity

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