Magnesium sulfate octahydrate is a chemical compound with the formula MgSO4·8H2O. It consists of magnesium, sulfur, and oxygen, combined with eight water molecules. This compound is commonly found in nature as the mineral epsomite and is often used in various applications, including agriculture and medicine. In agriculture, magnesium sulfate octahydrate serves as a fertilizer, providing essential nutrients to plants. In medicine, it is used in treatments for conditions like preeclampsia and as a laxative. Its crystalline form is typically white and can dissolve easily in water, making it versatile for different uses.