Polyhalite and Zoisite Physical Properties

Polyhalite

Zoisite

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Physical Properties

Tenacity

Brittle

Solubility

Soluble

Durability

Specific Gravity

2.783.20-3.50

1 7.18

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Fracture

Conchoidal

Uneven, Conchoidal, Even

Cleavage

Perfect on {10 1 }; parting on {010}

Perfect {010} imperfect {100}

Mohs Hardness

3.56-7

2 10

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Chemical Composition

K2Ca2Mg(SO4)4·2H2O

Ca₂Al₃(SiO₄)₃(OH)

Polyhalite and Zoisite Chemical Formula

While comparing Polyhalite and Zoisite 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 Polyhalite and Zoisite chemical formula.

Chemical formula of Polyhalite- K2Ca2Mg(SO4)4·2H2O
Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)

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Polyhalite and Zoisite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Polyhalite and Zoisite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Polyhalite and Zoisite Optical Properties during the identification of gemstone. Specific gravity of Polyhalite is 3.20-3.50 whereas that of Zoisite is 3.20-3.50.