Hercynite and Alexandrite Physical Properties

Hercynite

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

4.393.69-3.81

1 7.18

1.5 Fracture

ConchoidalGemdat.org, Uneven

Not Available

1.6 Cleavage

{111} Indistinct, {111} Indistinct, {111} Indistinct

1,1 ; 3,2.

1.7 Mohs Hardness

7.5-88.5

2 10

1.8 Chemical Composition

Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

BeAl ₂ O ₄

Hercynite and Alexandrite Chemical Formula

While comparing Hercynite 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 Hercynite and Alexandrite chemical formula.

Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)
Chemical formula of Alexandrite- BeAl ₂ O ₄

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Hercynite and Alexandrite Specific Gravity

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