Obsidian and Selenite Physical Properties

Obsidian and Selenite Chemical Formula

While comparing Obsidian and Selenite 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 Obsidian and Selenite chemical formula.

• Chemical formula of Obsidian- SiO2
• Chemical formula of Selenite- CaSO4·2H2O

Obsidian and Selenite Specific Gravity

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