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Sillimanite
Sillimanite

Gahnite
Gahnite



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Sillimanite
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Gahnite

Sillimanite and Gahnite 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)
 
-
-
-
4.00-4.62
Conchoidal, Uneven
Indistinct parting on [111]
7.5-8
ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)

Sillimanite and Gahnite Chemical Formula

While comparing Sillimanite and Gahnite 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 Gahnite chemical formula.

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Sillimanite and Gahnite Specific Gravity

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