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Sillimanite
Sillimanite

Biotite
Biotite



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Sillimanite
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Biotite

Sillimanite and Biotite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
 
Brittle
-
-
2.7-3.3
Uneven, Even
Perfect on the {001}
2.5-3.0
K(Mg,Fe++)3[AlSi3O10(OH,F)2

Sillimanite and Biotite Chemical Formula

While comparing Sillimanite and Biotite 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 Sillimanite and Biotite chemical formula.

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Sillimanite and Biotite Specific Gravity

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