Hackmanite and Alexandrite Physical Properties

Hackmanite

Alexandrite

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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

2.27-2.33

3.69-3.81

1.5 Fracture

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)

Not Available

1.6 Cleavage

Not Available

1,1 ; 3,2.

1.7 Mohs Hardness

5.5-6

8.5

1.8 Chemical Composition

Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)

BeAl ₂ O ₄

Hackmanite and Alexandrite Chemical Formula

While comparing Hackmanite 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 Hackmanite and Alexandrite chemical formula.

Chemical formula of Hackmanite- Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Hackmanite and Alexandrite Specific Gravity

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