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Petalite
Petalite

Sillimanite
Sillimanite



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Petalite
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Sillimanite

Petalite and Sillimanite Physical Properties

1 Physical Properties
1.1 Tenacity
Brittle
Tough
1.2 Solubility
insoluble
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.403.20-3.26
Amber
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
Amber
2 10
1.8 Chemical Composition
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
Al 2SiO 5Michael O’Donoghue , 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 O’Donoghue , Gems, Sixth Edition (2006) More from other references
  • Chemical formula of Sillimanite- Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)

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.