Adularia and Opal Physical Properties

Adularia and Opal Chemical Formula

While comparing Adularia and 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 Adularia and Opal chemical formula.

• Chemical formula of Adularia- KAlSi 3O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
• Chemical formula of Opal- SiO₂ · nH₂O

Adularia and Opal Specific Gravity

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