Helenite and Polyhalite Physical Properties

Helenite

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

Not Available2.78

1 7.18

1.5 Fracture

Not Available

Conchoidal, Brittle

1.6 Cleavage

Not Available

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

1.7 Mohs Hardness

Not Available3.5

2 10

1.8 Chemical Composition

Not Available

Helenite and Polyhalite Chemical Formula

While comparing Helenite 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 Helenite and Polyhalite chemical formula.

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Helenite and Polyhalite Specific Gravity

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