Nepheline is a mineral primarily composed of sodium and aluminum silicate. It typically appears as a light-colored, glassy rock and is often found in igneous rocks, particularly in alkaline environments. Nepheline is important in the production of ceramics and glass due to its ability to lower melting temperatures. This mineral can also be associated with other minerals like feldspar and zeolite. Nepheline is often used in the manufacturing of certain types of glass and as a filler in various industrial applications. Its unique properties make it valuable in both geological studies and commercial uses.