Zoisite and Achroite Physical Properties

Zoisite

Achroite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

3.20-3.502.90-3.40

1 7.18

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Fracture

Uneven, Conchoidal, Even

Uneven, ConchoidalWalter Schumann

Cleavage

Perfect {010} imperfect {100}

Indiscernible

Mohs Hardness

6-77-7.5

2 10

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Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

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.

Zoisite and Achroite Chemical Formula

While comparing Zoisite and Achroite 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 Achroite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
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.

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Zoisite and Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.