Petalite and Sillimanite Physical Properties

Petalite

Sillimanite

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1 Physical Properties

1.1 Tenacity

Brittle

Tough

1.2 Solubility

insoluble

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

2.403.20-3.26

1 7.18

1.5 Fracture

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

Splintery

1.6 Cleavage

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

{010} perfect

1.7 Mohs Hardness

6-6.56-7.5

2 10

1.8 Chemical Composition

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

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

Petalite and Sillimanite Chemical Formula

While comparing Petalite 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 Petalite and Sillimanite chemical formula.

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

Compare Gems Found In Australia

Petalite Vs Scolecite

Petalite Vs Sapphire

Petalite Vs Scheelite

Petalite and Sillimanite Specific Gravity

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