Selenite and White Opal Physical Properties

Selenite and White Opal Chemical Formula

While comparing Selenite and White Opal 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 White Opal chemical formula.

• Chemical formula of Selenite- CaSO4·2H2O
• Chemical formula of White Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Selenite and White Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Selenite and White Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Selenite and White Opal Optical Properties during the identification of gemstone. Specific gravity of Selenite is 1.98-2.50 whereas that of White Opal is 1.98-2.50.