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Phenakite
Phenakite

Sillimanite
Sillimanite



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Phenakite
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Sillimanite

Phenakite and Sillimanite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
2.90-2.98
Conchoidal, ConchoidalWalter Schumann
Distinct on {11 2 0}, imperfect on {10 1 1}
7.5-8
Be 2SiO 4Michael 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)

Phenakite and Sillimanite Chemical Formula

While comparing Phenakite 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 Phenakite and Sillimanite chemical formula.

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Phenakite and Sillimanite Specific Gravity

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