When it comes to choosing the best pick among Brown Gemstones gemstones, Allanite is known to be a popular choice!Physical properties of Allanite include its hardness, gravity, fracture, cleavage, etc. For any gemstone crystal, Allanite 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. Allanite cleavage is nothing but the plane across which the crystal splits during cutting. and specific gravity of Allanite is 3.40-4.20.
The physical properties of Allanite, 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.