Biotite and Marcasite Physical Properties

Biotite and Marcasite Chemical Formula

While comparing Biotite and Marcasite 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 Marcasite chemical formula.

• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
• Chemical formula of Marcasite- FeS 2Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Biotite and Marcasite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Marcasite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Marcasite Optical Properties during the identification of gemstone. Specific gravity of Biotite is 4.80-4.90 whereas that of Marcasite is 4.80-4.90.