Chromite and Rubellite Physical Properties

Chromite

Rubellite

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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

4.5-4.83.01-3.06

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

5.57-7.5

2 10

1.8 Chemical Composition

Fe++Cr2O4

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

Chromite and Rubellite Chemical Formula

While comparing Chromite and Rubellite 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 Rubellite chemical formula.

Chemical formula of Chromite- Fe++Cr2O4
Chemical formula of Rubellite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.

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Chromite and Rubellite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Chromite and Rubellite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Chromite and Rubellite Optical Properties during the identification of gemstone. Specific gravity of Chromite is 3.01-3.06 whereas that of Rubellite is 3.01-3.06.