Gahnite and Common Opal Physical Properties

Gahnite and Common Opal Chemical Formula

While comparing Gahnite and Common 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 Gahnite and Common Opal chemical formula.

• Chemical formula of Gahnite- ZnAl 2O 4Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Gahnite and Common Opal Specific Gravity

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