Biotite and Verdelite Physical Properties

Biotite and Verdelite Chemical Formula

While comparing Biotite and Verdelite 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 Verdelite chemical formula.

• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
• Chemical formula of Verdelite- 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 Verdelite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Verdelite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Verdelite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.90-3.40 whereas that of Verdelite is 2.90-3.40.