The mineral commonly used in fireworks is potassium nitrate, also known as saltpeter. Potassium nitrate serves as an oxidizer in the pyrotechnic mixture, providing the necessary oxygen to fuel the combustion of other materials. This mineral is a key component in many firework formulations, helping produce vibrant colors and effects during displays. Different metal salts are added to create various colors: strontium for red, barium for green, and sodium for yellow. The precise combination of ingredients in fireworks ensures spectacular visual displays, making potassium nitrate a vital mineral in the art of pyrotechnics.