Benitoite and Alexandrite Physical Properties

Benitoite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Insoluble: HCl

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.61-3.683.69-3.81

1 7.18

1.5 Fracture

Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle

Not Available

1.6 Cleavage

[10 1 1] poor

1,1 ; 3,2.

1.7 Mohs Hardness

6-6.58.5

2 10

1.8 Chemical Composition

BaTiSi 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

BeAl ₂ O ₄

Benitoite and Alexandrite Chemical Formula

While comparing Benitoite 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 Benitoite and Alexandrite chemical formula.

Chemical formula of Benitoite- BaTiSi 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Benitoite and Alexandrite Specific Gravity

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