Alexandrite and Rossmanite Physical Properties

Alexandrite

Rossmanite

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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

1 7.18

1.5 Fracture

Not Available

Brittle, Metallic

1.6 Cleavage

1,1 ; 3,2.

None

1.7 Mohs Hardness

8.5Not Available

2 10

1.8 Chemical Composition

BeAl ₂ O ₄

◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Alexandrite and Rossmanite Chemical Formula

While comparing Alexandrite and Rossmanite 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 Rossmanite chemical formula.

Chemical formula of Alexandrite- BeAl ₂ O ₄
Chemical formula of Rossmanite- ◻(LiAl 2)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

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Alexandrite and Rossmanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Alexandrite and Rossmanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Alexandrite and Rossmanite Optical Properties during the identification of gemstone. Specific gravity of Alexandrite is 3 whereas that of Rossmanite is 3.