Jet and Sillimanite Physical Properties

Jet

Sillimanite

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1 Physical Properties

1.1 Tenacity

Not Available

Tough

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

1.19-1.353.20-3.26

1 7.18

1.5 Fracture

ConchoidalWalter Schumann, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references

Splintery

1.6 Cleavage

Not Available

{010} perfect

1.7 Mohs Hardness

2.5-46-7.5

2 10

1.8 Chemical Composition

Not Available

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

Jet and Sillimanite Chemical Formula

While comparing Jet and Sillimanite 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 Jet and Sillimanite chemical formula.

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

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Jet and Sillimanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Jet and Sillimanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Jet and Sillimanite Optical Properties during the identification of gemstone. Specific gravity of Jet is 3.20-3.26 whereas that of Sillimanite is 3.20-3.26.