Biotite and Muscovite Physical Properties

Biotite

Muscovite

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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

Elastic

2.78-2.88

Perfect on the {001}

2-3

KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references

Biotite and Muscovite Chemical Formula

While comparing Biotite and Muscovite 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 Muscovite chemical formula.

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Biotite and Muscovite Specific Gravity

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