When it comes to choosing the best pick among Organic gemstones, Coral is known to be a popular choice!Physical properties of Coral include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Coral Optical Properties are responsible for imparting various physical properties to its structure. Knowledge of these properties is equally important to gem-cutters as well as to consumers. Coral cleavage is nothing but the plane across which the crystal splits during cutting. and specific gravity of Coral is 2.60-2.70.
The physical properties of Coral, in fact, are imparted by the chemical composition of its individual molecule. The reactivity or inertness of the crystal is solely governed by its chemical structure. Chemical composition of Coral is represented by CaCO 3Ulrich Henn and Claudio C..