Rubellite and Corundum Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
insoluble
Durability
Not Available
Not Available
Specific Gravity
3.01-3.06
3.90-4.05
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Uneven, Gems, Difficult, Fibrous
Cleavage
Not Available
None – parting in 3 directions
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)
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.