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Biotite
Biotite

Sellaite
Sellaite



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Biotite
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Sellaite

Biotite and Sellaite Physical Properties

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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
 
Brittle
-
-
3.14-3.16
Conchoidal
Perfect on {010} and {110}
5-5.5
MgF 2Ulrich Henn and Claudio C.

Biotite and Sellaite Chemical Formula

While comparing Biotite and Sellaite 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 Sellaite chemical formula.

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Biotite and Sellaite Specific Gravity

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