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Petalite and Topaz Physical Properties


Topaz and Petalite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
insoluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.40   
3.49-3.57   

Fracture
Subconchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001) More from other references, Brittle, Conchoidal   
Subconchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle   

Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two   
[001] Perfect   

Mohs Hardness
6-6.5   
8   

Chemical Composition
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references   
Al2SiO4(F,OH)2   

Optical Properties >>
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Petalite and Topaz Chemical Formula

While comparing Petalite and Topaz 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 Petalite and Topaz chemical formula.

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Petalite and Topaz Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Topaz Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Topaz Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.49-3.57 whereas that of Topaz is 3.49-3.57.

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