Leucite is a mineral composed of potassium and aluminum silicate, commonly found in volcanic rocks. It typically appears as colorless or white crystals and is known for its glassy luster. Leucite is often associated with other minerals like feldspar and nepheline and is primarily used in ceramics and glass-making due to its ability to lower melting temperatures. This mineral is significant in geology, particularly in the study of igneous rocks. Leucite-rich rocks, such as leucitite, are important for understanding volcanic activity and the composition of the Earth's crust. Its presence can indicate specific conditions under which the rock formed.