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Spinel and Polyhalite Physical Properties


Polyhalite and Spinel Physical Properties


Physical Properties

Tenacity
Not Available   
Brittle   

Solubility
none   
Soluble   

Durability
Not Available   
Not Available   

Specific Gravity
3.64-3.66   
2.78   

Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)   
Conchoidal, Brittle   

Cleavage
None, but may exhibit slight parting   
Perfect on {10 1 }; parting on {010}   

Mohs Hardness
8   
3.5   

Chemical Composition
MgAl2O4   
Not Available   

Optical Properties >>
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Spinel and Polyhalite Chemical Formula

While comparing Spinel and Polyhalite 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 Spinel and Polyhalite chemical formula.

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Spinel and Polyhalite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Spinel and Polyhalite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Polyhalite Optical Properties during the identification of gemstone. Specific gravity of Spinel is 2.78 whereas that of Polyhalite is 2.78.

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