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Petalite
Petalite
☒

Sillimanite
Sillimanite
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Petalite
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Sillimanite

Petalite and Sillimanite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
insoluble
-
2.40
Subconchoidal, ConchoidalWalter Schumann, Conchoidal
Perfect on {001}, poor on {201} with 38.5° angle between the two
6-6.5
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references
 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
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.

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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 Vs Sillimanite during the identification of gemstone. Specific gravity of Petalite is whereas that of Sillimanite is .