Biotite and Sardonyx Physical Properties

Biotite and Sardonyx Chemical Formula

While comparing Biotite and Sardonyx 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 Sardonyx chemical formula.

• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2
• Chemical formula of Sardonyx- SiO 2Ulrich Henn and Claudio C.

Biotite and Sardonyx Specific Gravity

Another important criteria for qualitative analysis of gemstones is Biotite and Sardonyx Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Biotite and Sardonyx Optical Properties during the identification of gemstone. Specific gravity of Biotite is 2.55-2.70 whereas that of Sardonyx is 2.55-2.70.