Biotite and Williamsite Physical Properties

Biotite and Williamsite Chemical Formula

While comparing Biotite and Williamsite 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 Williamsite chemical formula.

• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
• Chemical formula of Williamsite- (Mg,Fe2+ ) 3Si 2O 5(OH) 4Anthony et al , Handbook of mineralogy (2001)

Biotite and Williamsite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Williamsite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Williamsite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.51-2.63 whereas that of Williamsite is 2.51-2.63.