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Sillimanite
Sillimanite

Andalusite
Andalusite



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Sillimanite
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Andalusite

Sillimanite and Andalusite 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)
 
-
-
-
3.05-3.21
Uneven, Subconchoidal, Splintery
Good on {110}, poor on {100}
7.5
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references

Sillimanite and Andalusite Chemical Formula

While comparing Sillimanite and Andalusite 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 Andalusite chemical formula.

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Sillimanite and Andalusite Specific Gravity

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