When it comes to choosing the best pick among Gems for Sagittarius gemstones, Lapis lazuli is known to be a popular choice!Physical properties of Lapis lazuli include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Lapis lazuli 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. Lapis lazuli cleavage is nothing but the plane across which the crystal splits during cutting. Lapis lazuli cleavage is 3,6,and specific gravity of Lapis lazuli is 2.50-3.00.
The physical properties of Lapis lazuli, 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 Lapis lazuli is represented by The chief constituent Lapis Lazuli is Lazurite, with the following chemical formula: (Na,Ca)8Al6Si6O24(S,SO)4.