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Alunite and Star Sapphire Physical Properties


Star Sapphire and Alunite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
Soluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.6-2.9   
3.90-4.05   

Fracture
Conchoidal, Uneven   
Not Available   

Cleavage
On {0001}, perfect   
Not Available   

Mohs Hardness
3.5-4   
Not Available   

Chemical Composition
KAl3(SO4)2(OH)6   
Al 2O 3Ulrich Henn and Claudio C.   

Optical Properties >>
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Alunite and Star Sapphire Chemical Formula

While comparing Alunite and Star Sapphire 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 Alunite and Star Sapphire chemical formula.

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Alunite and Star Sapphire Specific Gravity

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

Red Gemstones

Red Gemstones


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