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Petalite and Brookite Physical Properties


Brookite and Petalite Physical Properties


Physical Properties

Tenacity
Brittle   
Brittle   

Solubility
insoluble   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
2.40   
3.87-4.14   

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

Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two   
Poor on {120}, in traces on {001}   

Mohs Hardness
6-6.5   
5.5-6   

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

Optical Properties >>
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Petalite and Brookite Chemical Formula

While comparing Petalite and Brookite 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 Brookite chemical formula.

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Petalite and Brookite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Brookite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Brookite Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.87-4.14 whereas that of Brookite is 3.87-4.14.

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