Gypsum powder is a natural product found in deposits throughout the United States. It begins as a soft, white mineral rock and is processed to make a dry powder. Naturally occurring gypsum is composed of calcium, sulfur, oxygen and hydrogen. Gypsum powder is mainly used in building materials such as drywall, but it is also useful in agriculture as a soil fertilizer and conditioner. Gypsum can be also be used as a food additive to enhance the texture of ingredients in processed foods.