Alkaline rocks are a type of igneous rock that contain a high concentration of alkaline minerals, such as sodium and potassium. These rocks typically form from magma that is rich in these elements, leading to unique chemical compositions. Common examples include nepheline syenite and trachyte. These rocks are often found in volcanic regions and can provide valuable insights into the geological processes of the Earth. Alkaline rocks are also important in various industrial applications, including the production of glass and ceramics, due to their specific mineral content and properties.