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Cordierite
Cordierite

Black Opal
Black Opal



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Cordierite
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Black Opal

Cordierite and Black Opal Physical Properties

Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
2.57-2.66
Subconchoidal, Conchoidal
Fair on {100}, poor on {001} and {010}
7-7.5
Mg2Al4Si5O18
 
-
-
-
1.97-2.22
Conchoidal
None
6-6.5
SiO 2 + H 2OUlrich Henn and Claudio C.

Cordierite and Black Opal Chemical Formula

While comparing Cordierite 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 Cordierite and Black Opal chemical formula.

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Cordierite and Black Opal Specific Gravity

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