Zoisite and Poudretteite Physical Properties

Zoisite

Poudretteite

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Physical Properties

Tenacity

Brittle

Solubility

Durability

Specific Gravity

3.20-3.502.51-2.53

1 7.18

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Fracture

Uneven, Conchoidal, Even

Conchoidal, Splintery

Cleavage

Perfect {010} imperfect {100}

None

Mohs Hardness

6-75

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

Zoisite and Poudretteite Chemical Formula

While comparing Zoisite and Poudretteite 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 Poudretteite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Poudretteite- KNa 2B 3Si 12O 30Michael OâDonoghue , Gems, Sixth Edition (2006)

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Zoisite and Poudretteite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Poudretteite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Poudretteite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 2.51-2.53 whereas that of Poudretteite is 2.51-2.53.