Chromite and Achroite Physical Properties

Chromite

Achroite

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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

4.5-4.82.90-3.40

1 7.18

1.5 Fracture

Uneven

Uneven, Uneven, ConchoidalWalter Schumann, Gemstones of the world (2001)

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 Achroite Chemical Formula

While comparing Chromite and Achroite 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 Achroite chemical formula.

Chemical formula of Chromite- Fe++Cr2O4
Chemical formula of Achroite- 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 Achroite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Chromite and Achroite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Chromite and Achroite Optical Properties during the identification of gemstone. Specific gravity of Chromite is 2.90-3.40 whereas that of Achroite is 2.90-3.40.