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Petalite and Spinel Physical Properties


Spinel and Petalite Physical Properties


Physical Properties

Tenacity
Brittle   
Not Available   

Solubility
insoluble   
none   

Durability
Not Available   
Not Available   

Specific Gravity
2.40   
3.64-3.66   

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

Cleavage
Perfect on {001}, poor on {201} with 38.5° angle between the two   
None, but may exhibit slight parting   

Mohs Hardness
6-6.5   
8   

Chemical Composition
LiAlSi 4O 10Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references   
MgAl2O4   

Optical Properties >>
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Petalite and Spinel Chemical Formula

While comparing Petalite and Spinel 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 Spinel chemical formula.

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Petalite and Spinel Specific Gravity

Another important criteria for qualitative analysis of gemstones is Petalite and Spinel Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Petalite and Spinel Optical Properties during the identification of gemstone. Specific gravity of Petalite is 3.64-3.66 whereas that of Spinel is 3.64-3.66.

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