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Sillimanite
Sillimanite
☒

Fayalite
Fayalite
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Sillimanite
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Fayalite

Sillimanite and Fayalite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Tough
-
-
3.20-3.26
Splintery
{010} perfect
6-7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
4.392
Conchoidal
{010} moderate, {100} imperfect
6.5-7
Fe 2SiO 4Michael O’Donoghue , Gems, Sixth Edition (2006)

Sillimanite and Fayalite Chemical Formula

While comparing Sillimanite and Fayalite 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 Fayalite chemical formula.

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Sillimanite and Fayalite Specific Gravity

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