Zoisite and Gahnite Physical Properties

Zoisite

Gahnite

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1 Physical Properties

1.1 Tenacity

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.504.00-4.62

1 7.18

1.5 Fracture

Uneven, Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Even

Conchoidal, Uneven

1.6 Cleavage

Perfect {010} imperfect {100}

Indistinct parting on [111]

1.7 Mohs Hardness

6-77.5-8

2 10

1.8 Chemical Composition

Ca₂Al₃(SiO₄)₃(OH)

ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Zoisite and Gahnite Chemical Formula

While comparing Zoisite and Gahnite 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 Gahnite chemical formula.

Chemical formula of Zoisite- Ca₂Al₃(SiO₄)₃(OH)
Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

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Zoisite and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Zoisite and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Zoisite and Gahnite Optical Properties during the identification of gemstone. Specific gravity of Zoisite is 4.00-4.62 whereas that of Gahnite is 4.00-4.62.