Chromite and Opal Physical Properties

Chromite

Opal

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1 Physical Properties

1.1 Tenacity

Brittle

BrittleWalter Schumann

1.2 Solubility

Not Available

hot salt water

1.3 Durability

Not Available

1.4 Specific Gravity

4.5-4.81.98-2.25

1 7.18

1.5 Fracture

Uneven

Conchoidal, Conchoidal, Gemstones of the world (2001) More from other references, Brittle

1.6 Cleavage

None, parting may develop along {111}

None

1.7 Mohs Hardness

5.55-6.5

2 10

1.8 Chemical Composition

Fe++Cr2O4

SiO₂ · nH₂O

Chromite and Opal Chemical Formula

While comparing Chromite 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 Chromite and Opal chemical formula.

Chemical formula of Chromite- Fe++Cr2O4
Chemical formula of Opal- SiO₂ · nH₂O

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Chromite and Opal Specific Gravity

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