When it comes to choosing the best pick among Gems for Cancer gemstones, Calcite is known to be a popular choice!Physical properties of Calcite include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Calcite 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. Calcite cleavage is nothing but the plane across which the crystal splits during cutting. Calcite cleavage is Perfect on [10 1 1] three directions with angle of 74° 55,and specific gravity of Calcite is 2.67-2.73.
The physical properties of Calcite, 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 Calcite is represented by CaCO 3Ulrich Henn and Claudio C..