Alexandrite and Biotite Physical Properties

Alexandrite

Biotite

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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

3.69-3.812.7-3.3

1 7.18

1.5 Fracture

Not Available

Uneven, Even, Yellow, White

1.6 Cleavage

1,1 ; 3,2.

Perfect on the {001}

1.7 Mohs Hardness

8.52.5-3.0

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

K(Mg,Fe++)3[AlSi3O10(OH,F)2

Alexandrite and Biotite Chemical Formula

While comparing Alexandrite and Biotite 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 Biotite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

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Alexandrite and Biotite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.