Selenite and Afghanite Physical Properties

Selenite and Afghanite Chemical Formula

While comparing Selenite and Afghanite 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 Afghanite chemical formula.

• Chemical formula of Selenite- CaSO4·2H2O
• Chemical formula of Afghanite- (Na,Ca,K) 8(Si,Al) 12O 24(SO 4,Cl,CO 3) 3(H 2O)Arthur Thomas , Gemstones (2009)

Selenite and Afghanite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Selenite and Afghanite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Selenite and Afghanite Optical Properties during the identification of gemstone. Specific gravity of Selenite is 2.55-2.65 whereas that of Afghanite is 2.55-2.65.