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Sapphire and Alunite Physical Properties


Alunite and Sapphire Physical Properties


Physical Properties

Tenacity
Not Available   
Brittle   

Solubility
insoluble   
Soluble   

Durability
Not Available   
Not Available   

Specific Gravity
3.95-4.03   
2.6-2.9   

Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)   
Conchoidal, Uneven   

Cleavage
None, but may exhibit parting   
On {0001}, perfect   

Mohs Hardness
9   
3.5-4   

Chemical Composition
Al 2 O 3   
KAl3(SO4)2(OH)6   

Optical Properties >>
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Sapphire and Alunite Chemical Formula

While comparing Sapphire and Alunite 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 Sapphire and Alunite chemical formula.

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Sapphire and Alunite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sapphire and Alunite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Alunite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 2.6-2.9 whereas that of Alunite is 2.6-2.9.

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