Selenite and Biotite Physical Properties

Selenite and Biotite Chemical Formula

While comparing Selenite and Biotite 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 Selenite and Biotite chemical formula.

• Chemical formula of Selenite- CaSO4·2H2O
• Chemical formula of Biotite- K(Mg,Fe++)3[AlSi3O10(OH,F)2

Selenite and Biotite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Selenite and Biotite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Selenite and Biotite Optical Properties during the identification of gemstone. Specific gravity of Selenite is 2.7-3.3 whereas that of Biotite is 2.7-3.3.