Sillimanite and Petalite Physical Properties

Sillimanite

Petalite

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1 Physical Properties

1.1 Tenacity

Tough

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.20-3.262.40

1 7.18

1.5 Fracture

Splintery

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

1.6 Cleavage

{010} perfect

Perfect on {001}, poor on {201} with 38.5° angle between the two

1.7 Mohs Hardness

6-7.56-6.5

2 10

1.8 Chemical Composition

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

LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

Sillimanite and Petalite Chemical Formula

While comparing Sillimanite and Petalite 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 Petalite chemical formula.

Chemical formula of Sillimanite- Al 2SiO 5Michael OâDonoghue , Gems, Sixth Edition (2006)
Chemical formula of Petalite- LiAlSi 4O 10Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references

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Sillimanite and Petalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Petalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Petalite Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 2.40 whereas that of Petalite is 2.40.