Rubellite and Alexandrite Physical Properties
Tenacity
Not Available
Not Available
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.01-3.06
3.69-3.81
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Not Available
Cleavage
Not Available
1,1 ; 3,2.
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.
BeAl 2 O 4
Rubellite and Alexandrite Chemical Formula
While comparing Rubellite and Alexandrite 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 Alexandrite 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 Alexandrite- BeAl 2 O 4
Rubellite and Alexandrite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Rubellite and Alexandrite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Alexandrite Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 3.69-3.81 whereas that of Alexandrite is 3.69-3.81.