Alunite is a mineral composed of potassium, aluminum, and sulfate, often found in volcanic regions. It typically appears as a white or yellowish crystalline substance and is formed through the alteration of other minerals, particularly in the presence of sulfuric acid. Alunite is primarily used in the production of alum, a compound with various applications in water purification and food processing. This mineral is also significant in geology and mining, as it can indicate the presence of other valuable minerals. Alunite deposits are often associated with volcanic activity and can be found in locations such as Italy and Turkey.