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Petalite and Tourmaline Physical Properties


Tourmaline and Petalite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
insoluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.40   
2.85-3.35   

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

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

Mohs Hardness
6-6.5   
7-7.5   

Chemical Composition
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references   
Tourmaline is a series of several different minerals with unique chemical formulas. See The chemical formula of Tourmaline for details.   

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Petalite and Tourmaline Chemical Formula

While comparing Petalite and Tourmaline 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 Tourmaline chemical formula.

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Petalite and Tourmaline Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Tourmaline Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Tourmaline Optical Properties during the identification of gemstone. Specific gravity of Petalite is 2.85-3.35 whereas that of Tourmaline is 2.85-3.35.

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