Biotite and Polyhalite Physical Properties

Biotite

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

2.7-3.32.78

1 7.18

1.5 Fracture

Uneven, Even, Yellow, White

Conchoidal, Brittle

1.6 Cleavage

Perfect on the {001}

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

1.7 Mohs Hardness

2.5-3.03.5

2 10

1.8 Chemical Composition

K(Mg,Fe++)3[AlSi3O10(OH,F)2

Not Available

Biotite and Polyhalite Chemical Formula

While comparing Biotite 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 Biotite and Polyhalite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

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Biotite and Polyhalite Specific Gravity

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