Rubellite and Biotite Physical Properties
Tenacity
Not Available
Brittle
Solubility
Not Available
Not Available
Durability
Not Available
Not Available
Specific Gravity
3.01-3.06
2.7-3.3
Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Uneven, Even, Yellow, White
Cleavage
Not Available
Perfect on the {001}
Mohs Hardness
7-7.5
2.5-3.0
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.
K(Mg,Fe++)3[AlSi3O10(OH,F)2
Rubellite and Biotite Chemical Formula
While comparing Rubellite and Biotite 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 Biotite 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 Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
Rubellite and Biotite Specific Gravity
Another important criteria for qualitative analysis of gemstones is Rubellite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Rubellite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Rubellite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.