Polyhalite and Gahnite Physical Properties

Polyhalite

Gahnite

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Soluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.784.00-4.62

1 7.18

1.5 Fracture

Conchoidal, Brittle

Conchoidal, Uneven

1.6 Cleavage

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

Indistinct parting on [111]

1.7 Mohs Hardness

3.57.5-8

2 10

1.8 Chemical Composition

Not Available

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

Polyhalite and Gahnite Chemical Formula

While comparing Polyhalite 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 Polyhalite and Gahnite chemical formula.

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

Compare Red Gemstones

Polyhalite Vs Jacinth

Polyhalite Vs Vanadinite

Polyhalite Vs Heliotrope

Polyhalite and Gahnite Specific Gravity

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