Achroite and Hercynite Physical Properties

Achroite

Hercynite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

2.90-3.404.39

1 7.18

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Fracture

Uneven, ConchoidalWalter Schumann

Uneven

Cleavage

Indiscernible

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

Mohs Hardness

7-7.57.5-8

2 10

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Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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

Achroite and Hercynite Chemical Formula

While comparing Achroite and Hercynite 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 Achroite and Hercynite chemical formula.

Chemical formula of Achroite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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Achroite and Hercynite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Achroite and Hercynite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Achroite and Hercynite Optical Properties during the identification of gemstone. Specific gravity of Achroite is 4.39 whereas that of Hercynite is 4.39.