Zoisite and Hercynite Physical Properties

Zoisite

Hercynite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.20-3.504.39

1 7.18

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Fracture

Uneven, Conchoidal, Even

Uneven

Cleavage

Perfect {010} imperfect {100}

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

Mohs Hardness

6-77.5-8

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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

Zoisite and Hercynite Chemical Formula

While comparing Zoisite 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 Zoisite and Hercynite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Hercynite- Fe2+ Al 2O 4Gemdat.org , Management Team (2012)

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Zoisite and Hercynite Specific Gravity

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