User can create, shape and manipulate salt, a member of a wide range of chemicals formed when one or more hydrogen atoms of an acid has been replaced by a metal. They are usually crystalline at normal temperatures and dissolve in water to form positive and negative ions. There are two types of salt: Rock salt comes from mines exploited for their natural salt deposits, which are the result of the sea retreating over the course of geological epochs. Refined salt or "table salt" comes from rock salt.