Ammonium magnesium phosphate hexahydrate is primarily used in the field of analytical chemistry as a reagent for the detection and quantification of phosphate ions. It plays a crucial role in gravimetric analysis, where it helps in precipitating phosphate from solutions, allowing for accurate measurement of phosphate content in various samples. This compound is also employed in water treatment processes to remove excess phosphate, which can otherwise lead to eutrophication in aquatic ecosystems. Additionally, it finds application in the production of specialty fertilizers, where it serves as a slow-release source of both magnesium and phosphorus, essential nutrients for plant growth. In the medical field, it is sometimes used in the formulation of certain antacids and in the treatment of conditions related to phosphate imbalances. Its ability to form stable crystalline structures makes it useful in material science for the synthesis of advanced materials with specific properties.