Magnesia is a term that can refer to a few different things, but it is most commonly associated with a type of mineral or a region in Greece. The mineral, known as magnesite, is primarily composed of magnesium carbonate and is used in various industrial applications, including the production of refractory materials and fertilizers. In addition to the mineral, Magnesia is also a historical region in ancient Greece, known for its rich culture and contributions to philosophy and science. The area was home to several important cities, including Magnesia on the Maeander, which played a significant role in ancient Greek history.