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Sapphire and Andalusite Physical Properties


Andalusite and Sapphire Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
insoluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.95-4.03   
3.05-3.21   

Fracture
Uneven, Uneven, Gems, Sixth Edition (2006)   
Uneven, Subconchoidal, Uneven, Subconchoidal, Splintery, UnevenArthur Thomas, Gemstones (2009)   

Cleavage
None, but may exhibit parting   
Good on {110}, poor on {100}   

Mohs Hardness
9   
7.5   

Chemical Composition
Al 2 O 3   
Al 2SiO 5Michael O’Donoghue , Gems, Sixth edition (2006) More from other references   

Optical Properties >>
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Sapphire and Andalusite Chemical Formula

While comparing Sapphire and Andalusite 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 Andalusite chemical formula.

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Sapphire and Andalusite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Sapphire and Andalusite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Sapphire and Andalusite Optical Properties during the identification of gemstone. Specific gravity of Sapphire is 3.05-3.21 whereas that of Andalusite is 3.05-3.21.

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