Sodium sulfate decahydrate, also known as Glauber's salt, is a chemical compound with the formula Na2SO4·10H2O. It consists of sodium, sulfur, and oxygen, combined with ten water molecules. This compound appears as a white crystalline solid and is commonly used in various industries, including glass manufacturing and detergents. In nature, sodium sulfate decahydrate can be found in mineral deposits and is often produced through the evaporation of seawater. It is valued for its ability to absorb moisture, making it useful in drying agents and as a filler in certain applications.