Biotite and Pyrophyllite Physical Properties

Biotite

Pyrophyllite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

Brittle

2.7-3.3

Uneven, Even

Perfect on the {001}

2.5-3.0

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

2.65-2.90

{001} Perfect

-9999

Al 2Si 4O 10(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Pyrophyllite Chemical Formula

While comparing Biotite and Pyrophyllite 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 Pyrophyllite chemical formula.

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Biotite and Pyrophyllite Specific Gravity

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