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Black Opal
Black Opal

Iolite
Iolite



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Black Opal
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Iolite

Black Opal and Iolite Physical Properties

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1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.97-2.222.6-2.7
Amber
1 7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Not Available
1.6 Cleavage
Not Available
3,1
1.7 Mohs Hardness
6-6.57-7.5
Amber
2 10
1.8 Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Mg2Al4Si5O18

Black Opal and Iolite Chemical Formula

While comparing Black Opal and Iolite 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 Iolite chemical formula.

  • Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
  • Chemical formula of Iolite- Mg2Al4Si5O18

Black Opal and Iolite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Iolite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Iolite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 2.6-2.7 whereas that of Iolite is 2.6-2.7.