When it comes to choosing the best pick among Blue Gemstones gemstones, Sard is known to be a popular choice!Physical properties of Sard include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Sard 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. Sard cleavage is nothing but the plane across which the crystal splits during cutting. and specific gravity of Sard is 2.58-2.63.
The physical properties of Sard, 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 Sard is represented by SiO 2Ulrich Henn and Claudio C..