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Spinel and Black Opal Physical Properties


Black Opal and Spinel Physical Properties


Physical Properties

Tenacity
Not Available   
Not Available   

Solubility
none   
Not Available   

Durability
Not Available   
Not Available   

Specific Gravity
3.64-3.66   
1.97-2.22   

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

Cleavage
None, but may exhibit slight parting   
Not Available   

Mohs Hardness
8   
6-6.5   

Chemical Composition
MgAl2O4   
SiO 2 + H 2OUlrich Henn and Claudio C.   

Optical Properties >>
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Spinel and Black Opal Chemical Formula

While comparing Spinel and Black Opal 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 Black Opal chemical formula.

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Spinel and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Spinel and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Spinel and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Spinel is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.

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