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Sillimanite
Sillimanite

Cordierite
Cordierite



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Sillimanite
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Cordierite

Sillimanite and Cordierite 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)
 
Brittle
-
-
2.57-2.66
Subconchoidal, Conchoidal
Fair on {100}, poor on {001} and {010}
7-7.5
Mg2Al4Si5O18

Sillimanite and Cordierite Chemical Formula

While comparing Sillimanite and Cordierite 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 Cordierite chemical formula.

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Sillimanite and Cordierite Specific Gravity

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