When it comes to choosing the best pick among Violet Gemstones gemstones, Corundum is known to be a popular choice!Physical properties of Corundum include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Corundum 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. Corundum cleavage is nothing but the plane across which the crystal splits during cutting. Corundum cleavage is None – parting in 3 directions,and specific gravity of Corundum is 3.90-4.05.
The physical properties of Corundum, 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 Corundum is represented by Al 2O 3Arthur Thomas , Gemstones (2009).