Hercynite and Dravite Physical Properties

Hercynite

Dravite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

4.39

Uneven

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

7.5-8

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

3.03-3.18

Uneven, Irregular, Conchoidal

{???} Indistinct

7-7.5

Na(Mg 3)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)

Hercynite and Dravite Chemical Formula

While comparing Hercynite and Dravite 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 Dravite chemical formula.

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Hercynite and Dravite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Hercynite and Dravite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Hercynite Vs Dravite during the identification of gemstone. Specific gravity of Hercynite is whereas that of Dravite is .