Beryllonite and Alexandrite Physical Properties

Beryllonite

Alexandrite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.79-2.873.69-3.81

1 7.18

1.5 Fracture

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

Not Available

1.6 Cleavage

{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces

1,1 ; 3,2.

1.7 Mohs Hardness

5.5-68.5

2 10

1.8 Chemical Composition

NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

BeAl ₂ O ₄

Beryllonite and Alexandrite Chemical Formula

While comparing Beryllonite 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 Beryllonite and Alexandrite chemical formula.

Chemical formula of Beryllonite- NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Beryllonite and Alexandrite Specific Gravity

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