Biotite and Pyrite Physical Properties

Biotite

Pyrite

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Physical Properties

Tenacity

Brittle

Solubility

insoluble in water

Durability

Specific Gravity

2.7-3.35.00-5.20

1 7.18

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Fracture

Uneven, Even

Uneven, Conchoidal, ConchoidalWalter Schumann

Cleavage

Perfect on the {001}

Indistinct on {001}; partings on {011} and {111}

Mohs Hardness

2.5-3.06-6.5

2 10

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Chemical Composition

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

FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Pyrite Chemical Formula

While comparing Biotite and Pyrite 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 Pyrite chemical formula.

Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Chemical formula of Pyrite- FeS 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Biotite and Pyrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Pyrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Pyrite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 5.00-5.20 whereas that of Pyrite is 5.00-5.20.