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