Coral and Common Opal Physical Properties

Coral and Common Opal Chemical Formula

While comparing Coral 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 Coral and Common Opal chemical formula.

• Chemical formula of Coral- CaCO 3Ulrich Henn and Claudio C.
• Chemical formula of Common Opal- SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)

Coral and Common Opal Specific Gravity

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