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Topaz and Alexandrite Physical Properties


Alexandrite and Topaz Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
Not Available   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.49-3.57   
3.69-3.81   

Fracture
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle   
Not Available   

Cleavage
[001] Perfect   
1,1 ; 3,2.   

Mohs Hardness
8   
8.5   

Chemical Composition
Al2SiO4(F,OH)2   
BeAl 2 O 4   

Optical Properties >>
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Topaz and Alexandrite Chemical Formula

While comparing Topaz and Alexandrite 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 Topaz and Alexandrite chemical formula.

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Topaz and Alexandrite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Topaz and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Topaz and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Topaz is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.

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