Emerald and Black Opal Physical Properties

Emerald and Black Opal Chemical Formula

While comparing Emerald and Black 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 Emerald and Black Opal chemical formula.

• Chemical formula of Emerald- Be₃Al₂SiO₆
• Chemical formula of Black Opal- SiO 2 + H 2OUlrich Henn and Claudio C.

Emerald and Black Opal Specific Gravity

Another important criteria for qualitative analysis of gemstones is Emerald and Black Opal Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Emerald and Black Opal Optical Properties during the identification of gemstone. Specific gravity of Emerald is 1.97-2.22 whereas that of Black Opal is 1.97-2.22.