Rubellite and Corundum Physical Properties

Rubellite

Corundum

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1 Physical Properties

1.1 Tenacity

Not Available

Brittle

1.2 Solubility

Not Available

insoluble

1.3 Durability

Not Available

1.4 Specific Gravity

3.01-3.063.90-4.05

1 7.18

1.5 Fracture

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

Uneven, Uneven, Gems, Difficult, Fibrous

1.6 Cleavage

Not Available

None – parting in 3 directions

1.7 Mohs Hardness

7-7.59

2 10

1.8 Chemical Composition

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.

Al 2O 3Arthur Thomas , Gemstones (2009)

Rubellite and Corundum Chemical Formula

While comparing Rubellite and Corundum 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 Rubellite and Corundum chemical formula.

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.
Chemical formula of Corundum- Al 2O 3Arthur Thomas , Gemstones (2009)

Compare Blue Gemstones

Rubellite Vs Serendibite

Rubellite Vs Scorzalite

Rubellite Vs Shattuckite

Rubellite and Corundum Specific Gravity

Another important criteria for qualitative analysis of gemstones is Rubellite and Corundum Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Corundum Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 3.90-4.05 whereas that of Corundum is 3.90-4.05.