The chemical compound potassium chloride (KCl) is a metal halide salt composed of potassium and chlorine. In its pure state it is odorless. In it’s pure state, it is a white or colorless vitreous crystal, with a crystal structure that cleaves easily in three directions. Potassium chloride crystals are face-centered cubic. Potassium chloride is also referred to as muriate of potash and potash, particularly when used as a fertilizer. Potash varies in color from pink or red to white depending on the mining and recovery process used to extract it. Typically, solution mined potassium chloride is white and mechanically mined potassium chloride is red. The red color is usually iron contamination, but may also be other metal chloride impurities. This product might be called red potash as well.