Chromite and Black Opal Physical Properties

Chromite

Black Opal

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1 Physical Properties

1.1 Tenacity

Brittle

Not Available

1.2 Solubility

Not Available

1.3 Durability

Not Available

1.4 Specific Gravity

4.5-4.81.97-2.22

1 7.18

1.5 Fracture

Uneven

ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)

1.6 Cleavage

None, parting may develop along {111}

Not Available

1.7 Mohs Hardness

5.56-6.5

2 10

1.8 Chemical Composition

Fe++Cr2O4

SiO 2 + H 2OUlrich Henn and Claudio C.

Chromite and Black Opal Chemical Formula

While comparing Chromite 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 Chromite and Black Opal chemical formula.

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

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Chromite and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Chromite and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Chromite and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Chromite is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.