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Sillimanite and Spinel Physical Properties


Spinel and Sillimanite Physical Properties


Physical Properties

Tenacity
Tough   
Not Available   

Solubility
Not Available   
none   

Durability
Not Available   
Not Available   

Specific Gravity
3.20-3.26   
3.64-3.66   

Fracture
Splintery   
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)   

Cleavage
{010} perfect   
None, but may exhibit slight parting   

Mohs Hardness
6-7.5   
8   

Chemical Composition
Al 2SiO 5Michael O’Donoghue , Gems, Sixth Edition (2006)   
MgAl2O4   

Optical Properties >>
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Sillimanite and Spinel Chemical Formula

While comparing Sillimanite and Spinel 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 Spinel chemical formula.

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Sillimanite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sillimanite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sillimanite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Sillimanite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.

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