Rock Salt

People also know it as industrial salt or halite, which is another unrefined form of sodium chloride or what we know as table salt,
and it occurs as a result of the evaporation of large-scale salt water deposits such as seas, oceans, and lakes, and is formed at a depth of 1200 meters below their surface level.  Rock salt is characterized by a very high melting and boiling point, as its boiling point reaches 1412° C, and its melting point reaches approximately 800° C. It is also distinguished by its unique shape and color, as it usually comes in the form of colorless crystals or White, largely equal in size. The color of rock salt crystals varies to shades of gray depending on the amount and type of impurities present in them, and can also change color to pink,brown or yellow depending on the method of processing and the geological influences to which they were exposed.