Hackmanite and Polyhalite Physical Properties

Hackmanite

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

2.27-2.332.78

1 7.18

1.5 Fracture

UnevenArthur Thomas, Gemstones (2009), UnevenArthur Thomas, Gemstones (2009)

Conchoidal, Brittle

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

5.5-63.5

2 10

1.8 Chemical Composition

Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)

Not Available

Hackmanite and Polyhalite Chemical Formula

While comparing Hackmanite 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 Hackmanite and Polyhalite chemical formula.

Chemical formula of Hackmanite- Na 8Al 6Si 6O 24Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006)

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Hackmanite and Polyhalite Specific Gravity

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