Edible salt, also called table salt or just salt, is a mineral, one of a very few rocks commonly eaten by humans. There are different forms of edible salt: unrefined salt, refined salt, table salt or iodised salt. It is a crystalline solid, white, pale pink or light grey in colour, obtained from sea water or from rock deposits. Sea salt comes in fine or larger crystals. In nature, it includes not only sodium chloride, but also other vital trace minerals. Edible rock salts may be slightly greyish in colour due to this mineral content