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Iolite and Opal Physical Properties


Opal and Iolite Physical Properties


Physical Properties

Tenacity
Not Available   
BrittleWalter Schumann   

Solubility
Not Available   
hot salt water   

Durability
Not Available   
Not Available   

Specific Gravity
2.6-2.7   
1.98-2.25   

Fracture
Not Available   
Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle   

Cleavage
3,1   
None   

Mohs Hardness
7-7.5   
5-6.5   

Chemical Composition
Mg2Al4Si5O18   
SiO2 · nH2O   

Optical Properties >>
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Iolite and Opal Chemical Formula

While comparing Iolite and 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 Iolite and Opal chemical formula.

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Iolite and Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Iolite and Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Iolite and Opal Optical Properties during the identification of gemstone. Specific gravity of Iolite is 1.98-2.25 whereas that of Opal is 1.98-2.25.

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