Mineral salts are simple, inorganic substances made up of metallic chemical elements, such as iron, sodium, potassium, calcium and magnesium, or of non-metallic elements, such as chlorine and phosphorus.
They can be found in their non-solubilized form as a part of structures in an organism, like the calcium in bones. They can also be found solubilized in water as ions: such as, the sodium and potassium cations within cells.