Nepheline is a mineral primarily composed of sodium and aluminum silicate. It typically appears as a gray, white, or yellowish crystalline substance and is often found in igneous rocks, particularly in alkaline environments. Nepheline is important in the production of glass and ceramics due to its ability to lower melting temperatures. This mineral is commonly associated with other minerals such as feldspar and zeolites. It can also be used as a source of alumina in the manufacturing of aluminum. Nepheline deposits are found in various locations around the world, including parts of Canada and Norway.