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Ruby and Corundum Physical Properties


Corundum and Ruby Physical Properties


Physical Properties

Tenacity
Brittle   
Brittle   

Solubility
Not Available   
insoluble   

Durability
Not Available   
Not Available   

Specific Gravity
3.97-4.05   
3.90-4.05   

Fracture
Conchoidal   
Uneven, Uneven, Gems, Difficult, Fibrous   

Cleavage
No true cleavage   
None – parting in 3 directions   

Mohs Hardness
9   
9   

Chemical Composition
Al 2 O 3   
Al 2O 3Arthur Thomas , Gemstones (2009)   

Optical Properties >>
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Ruby and Corundum Chemical Formula

While comparing Ruby and Corundum 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 Ruby and Corundum chemical formula.

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Ruby and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Ruby and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Ruby and Corundum Optical Properties during the identification of gemstone. Specific gravity of Ruby is 3.90-4.05 whereas that of Corundum is 3.90-4.05.

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