Bornite and Polyhalite Physical Properties

Bornite

Polyhalite

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1 Physical Properties

1.1 Tenacity

Brittle

1.2 Solubility

Not Available

Soluble

1.3 Durability

Not Available

1.4 Specific Gravity

5.06-5.082.78

1 7.18

1.5 Fracture

Uneven, Subconchoidal, Conchoidal, Brittle

Conchoidal, Brittle

1.6 Cleavage

Poor on [111].

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

1.7 Mohs Hardness

3-3.253.5

2 10

1.8 Chemical Composition

Cu5FeS4

Not Available

Bornite and Polyhalite Chemical Formula

While comparing Bornite 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 Bornite and Polyhalite chemical formula.

Chemical formula of Bornite- Cu5FeS4

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Bornite and Polyhalite Specific Gravity

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