Opal and Hessonite Physical Properties

Opal and Hessonite Chemical Formula

While comparing Opal and Hessonite 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 Opal and Hessonite chemical formula.

• Chemical formula of Opal- SiO₂ · nH₂O
• Chemical formula of Hessonite- Ca3Al2(SiO4)3

Opal and Hessonite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Opal and Hessonite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Opal and Hessonite Optical Properties during the identification of gemstone. Specific gravity of Opal is 3.55-3.73 whereas that of Hessonite is 3.55-3.73.