Sillimanite and Vlasovite Physical Properties

Sillimanite

Vlasovite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

Nearly insoluble in HCl and HNO₃

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.97

1 7.18

1.5 Fracture

Splintery

Conchoidal, Brittle

1.6 Cleavage

{010} perfect

Distinct on {010}

1.7 Mohs Hardness

6-7.56

2 10

1.8 Chemical Composition

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

Not Available

Sillimanite and Vlasovite Chemical Formula

While comparing Sillimanite and Vlasovite 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 Vlasovite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)

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Sillimanite and Vlasovite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Vlasovite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Vlasovite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.97 whereas that of Vlasovite is 2.97.