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Black Opal
Black Opal

Chromite
Chromite



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Black Opal
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Chromite

Black Opal and Chromite Physical Properties

1 Physical Properties
1.1 Tenacity
Not Available
Brittle
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.97-2.224.5-4.8
Amber
1 7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven
1.6 Cleavage
Not Available
None, parting may develop along {111}
1.7 Mohs Hardness
6-6.55.5
Amber
2 10
1.8 Chemical Composition
SiO 2 + H 2OUlrich Henn and Claudio C.
Fe++Cr2O4

Black Opal and Chromite Chemical Formula

While comparing Black Opal and Chromite 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 Chromite chemical formula.

  • Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.
  • Chemical formula of Chromite- Fe++Cr2O4

Black Opal and Chromite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Black Opal and Chromite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Black Opal and Chromite Optical Properties during the identification of gemstone. Specific gravity of Black Opal is 4.5-4.8 whereas that of Chromite is 4.5-4.8.