Sillimanite and Biotite Physical Properties

Sillimanite

Biotite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.7-3.3

1 7.18

1.5 Fracture

Splintery

Uneven, Even, Yellow, White

1.6 Cleavage

{010} perfect

Perfect on the {001}

1.7 Mohs Hardness

6-7.52.5-3.0

2 10

1.8 Chemical Composition

Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

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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 and Biotite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.