Alexandrite and Rubellite Physical Properties

Alexandrite

Rubellite

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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

3.69-3.813.01-3.06

1 7.18

1.5 Fracture

Not Available

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

1,1 ; 3,2.

Not Available

1.7 Mohs Hardness

8.57-7.5

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Alexandrite and Rubellite Chemical Formula

While comparing Alexandrite and Rubellite 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 Rubellite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Rubellite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Alexandrite and Rubellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Rubellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Rubellite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3.01-3.06 whereas that of Rubellite is 3.01-3.06.