Selenite and Precious Opal Physical Properties

Selenite and Precious Opal Chemical Formula

While comparing Selenite and Precious 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 Precious Opal chemical formula.

• Chemical formula of Selenite- CaSO4·2H2O
• Chemical formula of Precious Opal- SiO 2 · nH 2OGemdat.org , Management Team (2012)

Selenite and Precious Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Selenite and Precious Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Selenite and Precious Opal Optical Properties during the identification of gemstone. Specific gravity of Selenite is 1.98-2.25 whereas that of Precious Opal is 1.98-2.25.