Inorganic Potassium Schoenite Salt is ideal for crops that do not tolerate chlorine such as potato, sugarcane. The Potassium Schoenite comes in white crystalline powder form. The Potassium Schoenite is double sulphate of potassium and magnesium. The Inorganic Potassium Schoenite Salt is composed of 22.24 % potassium oxide and 90% magnesium oxide.