Gahnite and Polyhalite Physical Properties

Gahnite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

4.00-4.622.78

1 7.18

1.5 Fracture

Conchoidal, Uneven

Conchoidal, Brittle

1.6 Cleavage

Indistinct parting on [111]

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

1.7 Mohs Hardness

7.5-83.5

2 10

1.8 Chemical Composition

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

Not Available

Gahnite and Polyhalite Chemical Formula

While comparing Gahnite and Polyhalite 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 Gahnite and Polyhalite chemical formula.

Chemical formula of Gahnite- ZnAl 2O 4Michael OâDonoghue , Gems, Sixth Edition (2006)

Compare Blue Gemstones

Gahnite Vs Hydrogrossular

Gahnite Vs Indicolite Blue Tourmaline

Gahnite Vs Howlite

Gahnite and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Gahnite and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Gahnite and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Gahnite is 2.78 whereas that of Polyhalite is 2.78.