* Anhydrite: A hard, white or gray mineral that is formed when gypsum loses water.
* Halite: A soft, white or pink mineral that is formed when sodium chloride precipitates from water.
* Sylvite: A soft, white or colorless mineral that is formed when potassium chloride precipitates from water.
* Carnallite: A soft, white or pink mineral that is formed when potassium chloride and magnesium chloride precipitate from water.
