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Corundum and Kyanite Physical Properties


Kyanite and Corundum Physical Properties


Physical Properties

Tenacity
Brittle   
Brittle   

Solubility
insoluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.90-4.05   
3.53-3.65   

Fracture
Uneven, Uneven, Gems, Difficult, Fibrous   
Splintery, Brittle, Metallic   

Cleavage
None – parting in 3 directions   
[100] perfect [010] imperfect with 79° angle between   

Mohs Hardness
9   
4-7   

Chemical Composition
Al 2O 3Arthur Thomas , Gemstones (2009)   
Not Available   

Optical Properties >>
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Corundum and Kyanite Chemical Formula

While comparing Corundum and Kyanite 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 Corundum and Kyanite chemical formula.

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Corundum and Kyanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Corundum and Kyanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Corundum and Kyanite Optical Properties during the identification of gemstone. Specific gravity of Corundum is 3.53-3.65 whereas that of Kyanite is 3.53-3.65.

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