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Black Opal
Black Opal

Gahnite
Gahnite



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Black Opal
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Gahnite

Black Opal and Gahnite Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.
 
-
-
-
4.00-4.62
Conchoidal, Uneven
Indistinct parting on [111]
7.5-8
ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)

Black Opal and Gahnite Chemical Formula

While comparing Black Opal and Gahnite 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 Black Opal and Gahnite chemical formula.

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Black Opal and Gahnite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Gahnite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal Vs Gahnite during the identification of gemstone. Specific gravity of Black Opal is whereas that of Gahnite is .